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Cite as: [1972] UKHL 4, [1972] AC 824

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JISCBAILII_CASE_CRIME

    Die Mercurii, 3° Maii 1972

    Parliamentary Archives,
    HL/PO/JU/4/3/1218

    HOUSE OF LORDS

    ALPHACELL LIMITED

    v.

    WOODWARD

    (on appeal from a Divisional Court of the
    Queen's Bench Division)

    Lord Wilberforce
    Viscount Dilhorne
    Lord Pearson
    Lord Cross of Chelsea
    Lord Salmon


    Lord Wilberforce

    MY LORDS,

    The enactment under which the Appellants have been convicted is the
    Rivers (Prevention of Pollution) Act, 1951. The relevant words are " if he
    " causes or knowingly permits to enter a stream any poisonous, noxious or
    " polluting matter ".

    The subsection evidently contemplates two things—causing, which must
    involve some active operation or chain of operations involving as the result
    the pollution of the stream ; knowingly permitting, which involves a failure
    to prevent the pollution, which failure, however, must be accompanied by
    knowledge. I see no reason either for reading back the word " knowingly "
    into the first limb, or for reading the first limb as, by deliberate contrast,
    hitting something which is unaccompanied by knowledge. The first limb
    involves causing and this is what has to be interpreted.

    In my opinion, " causing " here must be given a commonsense meaning
    and I deprecate the introduction of refinements, such as causa causans, effec-
    tive cause or novus actus. There may be difficulties where acts of third
    persons or natural forces are concerned but I find the present case compara-
    tively simple. The Appellants abstract water, pass it through their works
    where it becomes polluted, conduct it to a settling tank communicating
    directly with the stream, into which the polluted water will inevitably overflow
    if the level rises over the overflow point. They plan, however, to recycle the
    water by pumping it back from the settling tank into their works: if the
    pumps work properly this will happen and the level in the tank will remain
    below the overflow point. It did not happen on the relevant occasion due
    to some failure in the pumps.

    In my opinion, this is a clear case of causing the polluted water to enter
    the stream. The whole complex operation which might lead to this result
    was an operation deliberately conducted by the Appellants and I fail to see
    how a defect in one stage of it, even if we must assume that this happened
    without their negligence, can enable them to say they did not cause the
    pollution. In my opinion, complication of this case by infusion of the
    concept of mens rea, and its exceptions, is unnecessary and undesirable. The
    section is clear, its application plain. I agree with the majority of the
    Divisional Court, who upheld the conviction, except that rather than say
    that the actions of the Appellants were a cause of the pollution I think it
    more accurate to say that the Appellants caused the polluting matter to enter
    the stream.

    There are two previous decisions which call for brief comment. The first
    is Moses v. The Midland Railway Company [1915] 113 L.T. 451 which was
    decided upon similar terminology in section 5 of the Salmon Fishery Act.
    1861. The cause of the escape of the polluting creosote was a defective
    tap in the tank wagon which did not belong to the Railway Company but
    to a private owner. The conclusion that the Railway Company had not
    caused it to flow was, I should have thought, inevitable. The second is
    Impress (Worcester) Ltd. v. Rees [1971] 2 All E.R. 357. The Appellants
    had placed a fuel oil tank near, though not adjacent, to the River Severn.
    The oil escaped through a valve which was not kept locked. The Divisional

    2

    Court found that it was an inevitable conclusion of fact that some unautho-
    rised person had opened the valve for purposes unconnected with the Appel-
    lant's business. They held that the opening of the valve was of so powerful
    a nature that the conduct of the Appellant was not a cause of the flow of
    oil. I do not desire to question this conclusion, but it should not be regarded
    as a decision that in every case the act of a third person necessarily interrupts
    the chain of causation initiated by the person who owns or operates the
    installation or plant from which the flow took place. The answer to such
    questions is one of degree and depends upon a proper attribution of responsi-
    bility for the flow of the polluting matter.

    The actual question submitted to this House under the Administration of
    Justice Act, 1961, section 1(2) is:

    " Whether the offence of causing polluting matter to enter a stream
    " contrary to section 2 of the Rivers (Prevention of Pollution) Act 1951
    " can be committed by a person who has no knowledge of the fact that
    " polluting matter is entering the stream and has not been negligent in
    " any relevant respect."

    The answer to this, I suggest, should be yes, it being understood that the
    test is whether the person concerned caused or knowingly permitted the
    poisonous, noxious or polluting matter to enter the stream. As, in my
    opinion, the Appellants did so cause, I would dismiss the appeal.

    Viscount Dilhorne

    MY LORDS,

    The Appellants, Alphucell Ltd., were convicted by the magistrates at
    Radcliffe in Lancashire on an information that they had caused polluting
    matter to enter the River Irwell contrary to section 2(1) of the Rivers (Preven-
    tion of Pollution) Act, 1951.

    Section 2(1) so far as material, reads as follows:

    " Subject to this Act, a person commits an offence punishable under
    " this section-

    " (a) if he causes or knowingly permits to enter a stream any
    " poisonous, noxious or polluting matter . . ."

    At their Mount Sion works, which are on the bank of the river, the
    Appellants treated manilla fibres as part of the process of manufacturing
    paper. The fibres had to be boiled and the water in which they were boiled
    became seriously polluted. It was drained into tanks from which it was
    removed by road tankers. There was also a washing process and the water
    used in the washing process was drained into two settling tanks situated on
    the edge of the river. One settling tank was higher than the other and the
    overflow from the higher tank went into the lower. In a shed above the
    lower tank there were two pumps with pipes extending downwards into the
    liquid in the lower tank, through which the water was sucked and pumped
    back into a reservoir from which it could be taken and, after filtration, used
    again.

    If the pumps worked properly, there should have been no overflow from
    the lower tank, but if that tank did overflow, the liquid flowing from it went
    straight into a channel, provided for the purpose, which led straight into the
    river. So if the pumps for some reason failed to operate properly, the system
    instituted by the Appellants made provision for any overflow to go straight
    into the river.

    One of the two pumps worked automatically, coming into operation when
    the water in the lower tank reached a certain level and switching itself off
    when the level dropped 3 feet 3 inches below the level at which it would
    overflow into the river. The other pump was manually operated.

    Evidence was given by a consultant of the paper trade, a Mr. Evans, who
    had been concerned with the planning of the circulation of the water. He

    3

    said that one pump was sufficient to keep the liquid from overflowing if
    nothing went wrong, and that the second pump was there in case anything
    went wrong with the first.

    At 4.30 p.m. on Tuesday the 25th November, 1969. an Assistant Inspector
    employed by the Mersey and Weaver River Authority saw that liquid was
    overflowing from the lower tank into the river at the rate, he estimated, of
    250 gallons an hour. Both pumps were then working. He took samples,
    analysis of which showed that the liquid being discharged had a biological
    oxygen demand of 160 milligrammes per litre. The River Authority only
    permitted the discharge of an effluent with a biological oxygen demand not
    exceeding 20 milligrammes per litre.

    Each of the pipes which carried the water to the pumps was fitted with a
    rose to prevent foreign matter being sucked into the pump. The holes in
    each rose were 3/4 of an inch in diameter.

    Mr. Atkinson, a foreman employed by the Appellants, testified that on
    the 25th November he had inspected the tanks at 8.15 a.m. and that one
    pump was operating then. He inspected the tanks again at 11.15 a.m. and
    saw that the level in the lower tank was rising so he switched on the second
    pump. He made another inspection at 1.15 p.m. and did not notice any
    difference in the level. He came back again at 3.45 p.m. and the level in
    the tank was the same despite the fact that both pumps had been operating
    since 11.15 a.m.

    If Mr. Atkinson knew that if nothing was wrong, one pump was sufficient
    to cope with the flow and to prevent an overflow, he surely should have
    suspected that something was seriously wrong when he found that both
    pumps operating for several hours had not lowered the level of the water.

    A fitter employed by the Appellants, a Mr. Courtney, stated that he had
    inspected and emptied the roses at the end of the pipes every week-end and
    that both pumps had been inspected by him during the week-end before the
    25th November. He said that he had then inspected the impellers to the
    pumps and had got his fingers in the vents.

    After the samples were taken the pumps were stopped and dismantled.
    It was then found that brambles, ferns and long leaves were wrapped around
    each impeller and that the vents of both pipes were blocked. Mr. Courtney
    said that he had installed the pumps and had been employed there ever
    since and that he had never before found such things in the pumps.

    If it be the case that the pumps were properly inspected during the week-end
    and were then in proper order, the brambles and leaves must have got into
    the impellers on the Monday and Tuesday and, if the roses at the end of
    each pipe were in place, have been sucked through the 3/4 inch holes in the
    roses. It sounds improbable that this should have happened with both pumps
    in so short a time to such a degree that both pumps were blocked but one
    does not know, for the Case Stated does not reveal, what conclusion, if any.
    the magistrates came to about this.

    The Case Stated is unfortunately in an unsatisfactory form. In paragraph
    2 the magistrates said that they found the following facts. One would expect
    that to be followed by a statement of the facts found, that is to say, the
    conclusions on questions of fact to which the justices had come after hearing
    the evidence. But paragraph 3 of the Case merely sets out the evidence the
    magistrates had heard and not their conclusions thereon. Merely to set out
    the evidence is no substitute for findings of fact.

    Paragraph 3 records that one witness said that the Appellants had taken
    all reasonable steps to make sure that water did not escape into the river.
    Did the magistrates accept this evidence and find as a fact that all reasonable
    steps had been taken or did they not do so? The Case Stated leaves that
    uncertain and were it not for the fact that it is possible to reach a conclusion
    in this appeal without knowing whether that had or had not been found, 1
    would have been in favour of the case being sent back to the magistrates to
    be properly stated.


    4

    The Respondent, so the Case states, contended that the Appellants had
    caused polluting matter to enter the river and that they " had not done every-
    " thing in their power to ensure that the machinery which should ensure that
    " the tanks should not allow any overflow into the River had not work
    " efficiently" (sic). Presumably what was meant was that they had not
    done everything to ensure that it had not worked inefficiently.

    The justices in the paragraph numbered 7 in the Case (in fact paragraph 8)
    said that they were "of the opinion that the Appellants had caused the
    " polluting matter to enter the River by their failure to ensure that the
    " apparatus was maintained in a satisfactory condition to do the job for
    " which it was provided." One does not know whether they were of the
    opinion that that failure was due to negligence on the part of the Appellants,
    or their servants or whether it was their view that the Appellants had caused
    the overflow without negligence as they had installed a system which was
    bound to lead to an overflow if the pumps for one reason or another proved
    inadequate for their task.

    Mr. Glidewell for the Respondent did not seek in this House to contend
    that the justices' conclusion involved a finding of negligence and to support
    the conviction on that ground. On the evidence given it is apparent that
    the justices might well have concluded that there was negligence in not
    appreciating by 3.45 p.m. that the pumps were not working properly, and,
    in view of the improbability that sufficient debris to block the impellers and
    the vents of both pumps had been sucked in in the course of the Monday and
    Tuesday, that there had been negligence in the inspection at the week-end.

    In view of the attitude taken by the Respondent, though it may be that
    the justices were in fact of the opinion that there had been negligence, one
    must treat this case as one in which there was no finding of negligence on
    the part of the Appellants.

    In the Divisional Court, Lord Parker C.J. and Widgery L.J., as he then
    was, were in favour of dismissing the appeal. They found it unnecessary
    to consider whether the offence charged was an absolute offence. They were
    satisfied that the actions of the Appellants were a cause of the pollution and
    that in their opinion sufficed. Bridge J., dissenting, held that there could
    be no criminal liability for causing polluting matter to enter a stream unless
    there was actual knowledge on the part of the alleged offender or at least the
    means of knowledge that his act might be expected to lead to pollution.

    In this House Mr. Drake for the Appellants again contended that the
    Appellants had not caused the pollution ; that the section did not create an
    absolute offence and that the Appellants could not be convicted in the absence
    of knowledge or negligence on their part. He also contended that in a section
    which, like s.2(l), creates two offences, the fact that knowledge is required
    for one leads to the presumption that it is also required for the other, in
    other words, that s.2(l)(«) should be read as if it said "if he knowingly
    causes or knowingly permits ". He also relied on the well-known principle
    that if the wording of a penal statute is capable of two interpretations, that
    most favourable to the accused should be taken as the correct interpretation.

    The first question I propose to consider is, leaving the question of mens
    rea
    on one side, whether on the evidence the act or acts of the Appellants
    caused the pollution.

    It's immediate cause was the blocking of the impellers and vents.

    The presence of the polluting liquid on the bank of the river, and it would
    appear, within a foot or so of the river, was due to the acts of the Appellants.
    The provision of the settling tanks with an overflow channel from the lower
    tank leading directly to the river was directly due to their acts. When the
    works were operating, there was, under the system they had instituted, bound
    to be an overflow into the river unless the pumps provided were of sufficient
    capacity and working sufficiently efficiently to prevent that happening.

    5

    If they had not installed any pumps or only pumps of insufficient capacity
    and an overflow into the river had followed from the operation of the
    works, I do not think it could be suggested that their acts had not caused
    the overflow and consequent pollution. Does it make any difference if they
    had installed pumps of sufficient capacity and for some reason the pumps
    had broken down or were only able to pump a fraction of what they should
    have? I think not. It was the operation of the works which led to the flow
    of liquid to the tanks. It was that operation which, with the system they
    had installed, led to the liquid getting into the river. The roses at the end
    of the intake pipes must have been fitted because it was realised that there
    was a risk that without them debris would be sucked into and block the
    pumps. The fact that despite them debris was sucked in and prevented the
    pumps from working properly shows that that safeguard was insufficient and
    the result was the same as that which would have followed from the operation
    of the works if pumps of insufficient capacity had originally been installed.

    In these circumstances I see no escape from the conclusion that it was the
    acts of the Appellants that caused the pollution. Without their acts there
    would not have been this pollution. It was their operation of their works
    that led to the liquid getting into the tanks and their failure to ensure that
    the pumps were working properly that led to the liquid getting into the river.

    I therefore think that the justices conclusion on the facts was right.

    Then it is said that even if that was so, there should not have been a
    conviction for the offence charged was not an absolute offence. As my noble
    and learned friend. Lord Diplock, said in Sweet v. Parsley
    [1970] AC 132
    at p. 162: —

    " the expression ' absolute offence' ... is an imprecise phrase
    " currently used to describe an act for which the doer is subject to
    " criminal sanctions even though when he did it he had no mens rea,
    " but mens rea itself also lacks precision . . ."

    In this case it was argued that it was an essential ingredient of the offence
    that the Appellants should—the case being dealt with as if there was no
    negligence—have intended the entry of the polluting matter into the river,
    that is to say, that they should have intended the commission of the offence.
    I cannot think that that was the intention of Parliament for it would mean
    that a burden of proof would rest on the prosecution that could seldom be
    discharged. Only if the accused had been seen tipping the polluting material
    into a stream or turning on a tap allowing a polluting liquid to flow into a
    stream or doing something of a similar character could the burden be
    discharged. Parliament cannot have intended the offence to be of so limited
    a character. Ordinarily all that a river authority can establish is that a
    discharge has come into a stream from a particular source and that it is of
    a polluting character. But the Act does not say that proof of that will
    suffice. If that were so, the Act would indeed create an absolute offence.
    It has also to be proved that the accused caused or knowingly permitted the
    pollution.

    This Act is, in my opinion, one of those Acts to which my noble and learned
    friends. Lord Reid (at p. 149) and Lord Diplock (at p. 163) referred in Sweet
    v. Parsley (supra) which, to apply the words of Wright J. in Sherras v. De
    Rutzen
    [1895] 1 QB 918, deals with acts which "are not criminal in any
    " real sense, but are acts which in the public interest are prohibited under
    " a penalty ".

    What, then, is meant by the word " caused " in the subsection? If a man
    intending to secure a particular result, does an act which brings that about,
    he causes that result. If he deliberately and intentionally does certain acts
    of which the natural consequence is that certain results ensue, may he not
    also be said to have caused those results even though they may not have
    been intended by him? I think he can, just as he can be said to cause the
    result if he is negligent, without intending that result.


    6

    I find support for my view in the observations of Bowen L.J. in Kirkheaton
    District Local Board v. Ainley, Sons & Co.
    [1892] 2Q.B. 274. He said at
    p. 283 :

    " It appears to me that any person causes the flow of sewage into a
    " stream . . . who intentionally does that which is calculated according
    " to the ordinary course of things and the laws of nature to produce
    " such flow."

    We have not here to consider what the position would be if pollution was
    caused by an inadvertent and unintentional act without negligence. In such
    case it might be said that the doer of the act had not caused the pollution
    although the act had caused it. Here the acts done by the Appellants were
    intentional. They were acts calculated to lead to the river being polluted
    if the acts done by the Appellants, the installation and operation of the
    pumps, were ineffective to prevent it. Where a person intentionally does
    certain things which produce a certain result, then it can truly be said that
    he has caused that result, and here in my opinion the acts done intentionally
    by the Appellants caused the pollution.

    I now turn to the contention that the subsection should be read as if the
    word " knowingly " appeared before " causes ". Whether the inclusion of
    that word before " permits" makes any difference to the meaning of
    "permits", is, I think, open to doubt, for as Lord Goddard C.J. said in
    Lomas v. Peek [1947]1 2 All E.R. 574: —

    " If a man permits a thing to be done, it means that he gives permis-
    " sion for it to be done, and if a man gives permission for a thing to
    " be done, he knows what is to be done or is being done."

    (See also per Lord Diplock in Sweet v. Parsley (supra) at p. 162.)

    If the insertion of " knowingly " before " causes " meant only that the
    acts which produced the result must be intentional, then that insertion would
    not, in my view, add anything to the meaning to be given to the subsection.
    If, on the other hand, it meant that the accused must know what the end
    result would be, then it imports that the requirement of a guilty mind accom-
    panying the acts.

    In this connection reliance was placed on Derbyshire v. Houliston [1897]
    1Q.B. 772. That was a decision on a very different statute and I do not
    think that it constitutes any authority for the proposition that in this Act
    s.2(l)(a) must be read as if the word " knowingly " appeared before " causes ".
    I therefore reject this contention.

    In support of the contention that the offence in question is an absolute
    one, the Appellants relied on the last part of s.2(l) which provides that a
    local authority shall be deemed to cause or knowingly permit pollution
    which passes into a stream from a sewer or sewage disposal works of theirs
    where the local authority were bound to receive the polluting matter into
    the sewer or sewage disposal unit or had consented to do so. This was
    obviously intended to deal with a special case and to prevent a local authority
    from being able to contend that in such circumstances they had not caused
    the pollution. I do not consider that it throws any light on the meaning to be
    given to s.2(l)(a).

    The function of the courts is to interpret an Act " according to the intent
    of them that made it" (Coke 4 Inst: 330). If the language of a penal
    statute is capable of two interpretations, then that most favourable to the
    subject is to be applied. Having regard to the nature of the Rivers (Preven-
    tion of Pollution) Act, 1951, the mischief with which it was intended to deal
    and the fact that it comes within the category of Acts to which my noble and
    learned friends, Lord Reid and Lord Diplock, referred in Sweet v. Parsley
    (supra) I do not think that the subsection is capable of two interpretations
    or that it was intended to be interpreted or should be interpreted as making
    the causing of pollution only an offence if the accused intended to pollute.

    For these reasons I would dismiss the appeal with costs.

    7

    Lord Pearson

    MY LORDS,

    The Appellants have their Mount Sion Works at Radcliffe beside the River
    Irwell in Lancashire. Water is drawn from the river along a goit and is
    taken into the works and used in processing manilla fibres for use in paper-
    making. The first stage of the processing produces a very strong effluent
    which is removed by tankers and disposed of elsewhere: no question arises
    with regard to that effluent. At the second stage of the processing the fibres
    are washed, and this leaves polluted washing water, which is taken down to
    two settling tanks on the banks of the river. After some purification by
    settling, this water is re-circulated and used again in the processing. There
    are two pumps which draw water out of the settling tanks: one of these
    operates automatically in the sense that it switches itself on whenever the
    water in one of the settling tanks has risen to a certain level: the other is a
    standby pump which can be switched on manually when the automatic
    pump is not keeping down the level of the water. At the bottom of the
    intake pipe of each pump there is a rose, similar in principle to the rose in
    a watering can, with holes of three quarters of an inch diameter, intended to
    keep out foreign matter while admitting a sufficient inflow of water. As the
    settling tanks are beside the river, it must follow that, if the pumps fail to
    keep down the level of the water and the rising water overflows, the overflow
    must be into the river, and it is polluted water.

    On the 25th November, 1969, the processing plant had been in use for
    about a year, and it was being operated on that day. The foreman inspected
    the tanks at 8.15 a.m., and found the automatic pump working and every-
    thing normal. When he inspected the tanks again at 11.30 a.m., he found
    that the water level had risen and he switched on the standby pump. At
    1.15 p.m., and again at 3.45 p.m., he found the water level unchanged with
    both pumps working. But at 4.30 p.m., the River Authority Inspector visited
    the tanks and found that there was an overflow of polluted water from them
    into the river at a rate which he estimated at 250 gallons per hour. The
    Inspector took a sample of the polluted water immediately before it entered
    the river and on analysis it was found that the biochemical oxygen demand
    on this sample was 160 milligrams per litre whereas, when the River Authority
    allowed a discharge of effluent, the biochemical oxygen demand should be
    no more than 20 milligrams per litre.

    What had happened was that in each of the pumps the impeller had become
    clogged with foreign matter—brambles, bracken or ferns and long leaves—
    which had entered the intake pipe through the holes in the rose.

    There was evidence, accepted by the magistrates, from the Appellants'
    fitter to the effect that he had inspected the rose and the impeller and emptied
    the rose once a week and had done so on the Sunday preceding the 25th
    November, 1969, which was a Tuesday: and that the rose had never been
    blocked before or since that date ; but on that date he had found brambles,
    ferns and long leaves wrapped around the impeller and the vents blocked ;
    he had never found such things before in the pumps.

    There was also expert evidence, accepted by the magistrates, that the
    Appellants had taken all reasonable steps to make sure water did not escape
    into the river. The expert witness did say, however, that an alarm system
    would be desirable but there was not one on the 25th November, 1969. The
    Appellants' general manager said that as an extra aid to their foreman an
    alarm system, a probe actuating a bell, was installed in December, 1969,
    but that this alarm system was not essential as two pumps were adequate to
    keep the effluent out of the River Irwell and one pump was normally more
    than adequate. The general manager also said that neither he nor anyone
    in authority had knowledge of the discharge of effluent until informed by the
    Inspector. The foreman gave evidence of his regular inspection of the tanks.
    He said that the level of the water in the tanks depended on the amount of
    processing going on.


    8

    The magistrates said in paragraph 7 of the Case Stated: "We were of
    " the opinion that the Appellants had caused the polluting matter to enter
    " the River by their failure to ensure that the apparatus was maintained in
    " a satisfactory condition to do the job for which it was provided. We
    " accordingly convicted the Appellants."

    Counsel have stated that the Divisional Court with the assent of counsel
    assumed that the magistrates had not made any finding of negligence.
    Although perhaps a different view might have been taken of the evidence, I
    think, having regard to the findings of fact, that the assumption has to be
    made.

    The relevant enactment is section 2(l)(a) of the Rivers (Prevention of
    Pollution) Act, 1951, providing that: " Subject to this Act, a person commits
    " an offence punishable under this section—(a) if he causes or knowingly
    " permits to enter a stream any poisonous, noxious or polluting matter ".
    The question is whether the magistrates could properly find that the Appel-
    lants caused the polluted water to enter the River Irwell.

    It has been contended that the prosecution had to prove mens rea on the
    part of the Appellants, and consequently the Appellants were wrongly
    convicted because, even if they caused the polluted water to enter the river,
    they did not do so intentionally or knowingly. In my opinion, this contention
    fails. First, in the wording of the enactment there is the contrast between
    " causes " and " knowingly permits ", raising the inference that knowledge
    is not a necessary ingredient in the offence of " causing ". Secondly mens
    rea
    is generally not a necessary ingredient in an offence of this kind, which
    is in the nature of a public nuisance. In Sherras v. De Rutzen [1895] 1 Q.B.
    918 Wright J. said at p. 921-2: "There is a presumption that mens rea,
    " an
    evil intention, or a knowledge of the wrongfulness of the act, is an
    " essential ingredient in every offence ; but that presumption is liable to be
    " displaced either by the words of the statute creating the offence or by the
    " subject-matter with which it deals, and both must be considered: Nichols
    " v. Hall (L.R. 8 C.P. 322) ... the principal classes ... of exceptions may
    " perhaps be reduced to three. . . . Another class comprehends some, and
    " perhaps all, public nuisances: Reg. v. Stephens (L.R. 1 Q.B. 702) where the
    employer was held liable on indictment for a nuisance caused by workmen
    without his knowledge and contrary to his orders ; and so in Rex v. Medley
    " (6 C. & P. 292) and Barnes v. Akroyd (L.R. 7 Q.B. 474)." In R. v.
    Medley and Others there was an indictment against the directors and other
    officers of a Gas Company for discharging the refuse of gas manufacture
    into the Thames. Denman CJ. in summing-up said to the jury: " It is said
    " that the directors were ignorant of what had been done. In my judgment
    " that makes no difference ; provided you think that they gave authority to
    " Leadbeter to conduct the works they will be answerable."

    There is an authority on a similar enactment. In Moses v. The Midland
    Railway Company
    [1915] 113 L.T. 451 the railway company were convey-
    ing on their line a private owner's tank wagon containing creosote, and on
    the journey the creosote began to leak out from a defective tap and when
    this was discovered the train was stopped and the defect was remedied. Some
    of the creosote which leaked out found its way into a tributary of a salmon
    river. The railway company were prosecuted under section 5 of the Salmon
    Fishery Act, 1861, where the relevant wording was: "Every person who
    " causes or knowingly permits to flow, or puts or knowingly permits to be
    " put, into any waters containing salmon, or into any tributaries thereof,
    " any liquid or solid matter to such an extent as to cause the waters to
    " poison or kill fish, shall incur the following penalties. . . ." Lord
    Reading C.J. dealt only with causation, Avory J. dealt with mens
    rea
    at the beginning of his judgment, where he said: " I have had some
    " doubt about this case, because when it was first read to us I certainly
    understood it to mean that the creosote which caused the damage in fact
    " escaped from this tank while the train was pulled up and while the opera-
    " tions were going on for the purpose of repairing it. If that had been clearly
    " the state of facts I should have hesitated before agreeing with the view
    " that under these circumstances the railway company were not causing the

    9

    " liquid to flow into the stream within the meaning of this section, because
    " it appears to me to be not one of those cases where it is necessary to prove
    " any mens rea. It is an absolute prohibition, and the person liable is the
    " person who in fact causes the liquid to flow; and I do not think it is
    " necessary to show, in the words of one of the judgments quote to us, that
    " the person was intentionally causing the liquid to flow."

    I think the judgments of Lord Esher and Bowen L.J. in Kirkheaton District
    Local Board
    v. Ainley, Sons A Co.
    [1892] 2 QB 274 at pp. 281 and 283
    tend to show that mens rea was not a necessary ingredient in the offence of
    causing sewage to fall or flow into a stream contrary to the Rivers Pollution
    Prevention Act 1876. Lord Esher said at p. 281: " The sewage matter starts
    " from their premises by their volition in such a way that it must go through
    " a sewer, which, by the natural process of gravitation, will carry it into the
    " stream. Reading the words of the Act according to their ordinary meaning,
    " did or did not the defendants cause the sewage, which they thus sent from
    " their premises, to flow into the stream? It seems to me that they did.
    " Unless they had done what they did, it would not have flowed into the
    " stream. They seem to me to be the causa causans, or, at any rate, the causa
    " sine qua non"

    The view that mens rea is not a necessary ingredient in an offence of this
    kind seems to me to be consistent with, and supported by, what was said
    in Sweet v. Parsley
    [1970] AC 132 by Lord Pearce at p. 156 EFG and by
    Lord Diplock at p. 163 DEF.

    The Appellants' other contention is that they did not cause the polluted
    water to flow into the river. I think their main grounds for this contention
    are that they did not intend the polluted water to flow into the river, they
    did not know it was happening and (according to the assumption that has
    been made) it did not happen by reason of any negligence on their part.

    On the general question of causation there is an illuminating
    passage in the speech of Lord Shaw of Dunfermline in Leyland Shipping
    Co. v. Norwich Union Fire Insurance Society
    [1918] A.C. 350. He said at
    p. 369: " To treat proxima causa as the cause which is nearest in time is
    " out of the question. Causes are spoken of as if they were as distinct from
    " one another as beads in a row or links in the chain, but—if this meta-
    " physical topic has to be referred to—it is not wholly so. The chain of
    " causation is a handy expression, but the figure is inadequate. Causation
    " is not a chain, but a net. At each point influences, forces, events, precedent
    " and simultaneous, meet; and the radiation from each point extends
    " infinitely. At the point where these various influences meet it is for the
    " judgment as upon a matter of fact to declare which of the causes thus
    " joined at the point of effect was the proximate and which was the remote
    " cause."

    This passage may have been partly inspired by the argument of R. A.
    Wright K.C. (as he then was) at p. 352-3.

    In Yorkshire Dale Steamship Company Ltd. v. Minister of War Transport
    [1942] A.C. 691 at p. 698 Viscount Simon L.C. said "The interpretation to
    " be applied does not involve any metaphysical or scientific view of causation.
    " Most results are brought about by a combination of causes, and a search
    " for ' the cause ' involves a selection of the governing explanation in each
    " case." Lord Wright said at p. 706: " This choice of the real or efficient
    " cause from out of the whole complex of the facts must be made by apply-
    " ing commonsense standards."

    In Cork v. Kirby Maclean Ltd. [19521 2 All E.R. 402 at p. 407 Denning
    L.J. said: " It is always a matter of seeing whether the particular event was
    " sufficiently powerful a factor in bringing about the result as to be properly
    " regarded by the law as a cause of it."

    When one sets out to select in this case from the " whole complex of
    " the facts " the " governing explanation " of the overflow of polluted water
    into the river there are a number of factors to be taken into account. These
    include the absence of intention, the absence of knowledge and the assumed

    10

    absence of negligence on the part of the Appellants. It would have been
    easier to decide that they caused the overflow if they had intended it or
    known of it when it was happening or brought it about by their negligence.

    Nevertheless, I think that the magistrates and the majority of the Divisional
    Court were right in holding that the overflow was caused by the activities of
    the Appellants. Those were positive activities and they directly brought
    about the overflow. What other cause was there? There was no intervening
    act of a trespasser and no act of God. There was not even any unusual
    weather or freak of nature. Autumn is the season of the year in which dead
    leaves, ferns, pieces of bracken and pieces of brambles may be expected to
    fall into water and sink below the surface and if there is a pump to be sucked
    up by it.

    In my opinion, the activities of the Appellants were the cause of the over-
    flow of polluted water into the river. It is not necessary for the purposes
    of this case to decide whether a conviction should be upheld if the activities
    of a defendant were to be regarded as only a cause of such an overflow.
    Subject to reservation of that question I agree with the judgments of the
    majority in the Divisional Court.

    I would dismiss the appeal.

    Lord Cross of Chelsea

    MY LORDS,

    1 have found this a difficult case. At one time I was inclined to agree
    with the dissenting judgment of Bridge J. ; but in the end I have come to
    the conclusion that the appeal should be dismissed.

    The Appellants in the course of their business cause large quantities of
    polluted effluent to flow into a settling tank on the bank of the River Irwell.
    The tank would have inevitably overflowed with the result that the effluent
    would have entered the river had not the Appellants installed two pumps to
    keep the level of the water in the tanks low enough to prevent any overflow.
    At the base of the pumps there are or were metal " roses " with holes of a
    diameter of 3/4 inch designed to allow water to reach the pump freely but to
    prevent any solid matter which might get into the tank from passing through
    the rose and coming into contact with the impeller.

    On Tuesday 25th November, 1969, the pumps failed to prevent the settling
    lank from overflowing, the reason for the failure being—as was subsequently
    discovered—that a quantity of brambles, leaves and other vegetable matter
    had found its way through the holes in the " roses " and was wound round
    the impellers. The evidence, which the justices accepted, was to the effect
    that the " roses " had been regularly inspected each week-end since they had
    been installed a year previously, that no vegetable matter had been in them
    when the pumps were inspected a few days before the overflow, and indeed
    that no vegetable matter had ever been found in the pumps before. How
    all these brambles and leaves had found their way through the roses in the
    course of the two or three days before the 25th November was an unsolved
    mystery.

    These being the facts, did the Appellants commit the offence created by
    s.2 of the Rivers (Prevention of Pollution) Act, 1951, of "causing" the

    polluted effluent to enter the river? Bridge J. said—and I agree with him

    that the contrast drawn in the section between " causing " and " knowingly
    permitting " shows that a man cannot be guilty of causing polluting matter
    to enter a stream unless at the least he does some positive act in the chain
    of acts and events leading to that result. I cannot, however, follow him
    when he goes on to say that it is also necessary if the man is to be held to
    have " caused " the result that he should have known or have had the means
    of knowledge that his act might be expected to lead to it. Suppose that the
    contractor whom the Appellants had employed to install these works on the
    bank of the Irwell had provided a defective pump with the result that when11

    the Appellants operated their plant for the first time the tank had overflowed
    —surely they could fairly be said to have " caused " the pollution of the
    river even though they neither knew nor had any means of knowing that their
    act in setting the plant in operation would lead to that result? But, of
    course, the Appellants can say—and here lies the strength of their case—
    that the justices have not found that the pumps, albeit they had such wide
    holes in the roses, were unsuitable and that they have accepted the evidence
    of their employees as to the frequency and thoroughness of their inspections.
    This enables them to advance the argument which was accepted by Bridge J.
    that the unexplained presence of this quantity of vegetable matter wrapped
    round the impellers should be regarded as a separate cause of the pollution
    of the stream which relieves the Appellants from the responsibility for it. " If
    " it had been shown that the brambles had been put there by a trespasser " so
    the argument runs—"the Appellants could not be held to have 'caused'
    " the overflow. For all that one knows they may have been put there by
    " a trespasser. What difference does it make that one cannot say how they
    " came there providing that the Appellants have not been shown to be in
    " any way to blame for their presence?" This argument is plausible—but
    I think fallacious. The Appellants did not advance any evidence to show
    that the brambles had been placed there by a trespasser or that the
    " inanimate forces "—to use the words of Bridge J.—which brought them
    there were in the category of acts of God—analogous to the destruction of
    the pumps by lightning or the flooding of the tank by a storm of altogether
    unexampled severity and duration. All that the evidence shows is that
    despite the false sense of security into which the Appellants had been lulled
    by their experience over the past twelve months, vegetable matter was in
    fact liable to collect quite quickly inside the roses and that, although it may
    not be fair to blame them for not inspecting the roses more often than once
    a week, if they did not have more frequent inspections they were running the
    risk of " causing " polluting effluent to enter the river. It was not for the
    Respondents to prove that the Appellants had been negligent. The Appellants
    having started to operate their plant on that day could only escape being
    held to have caused polluted effluent to enter the river if they proved that the
    overflow of the tank had been brought about by some other event which
    could fairly be regarded as being beyond their ability to foresee or control.

    1 would, therefore, dismiss the appeal.

    Lord Salmon

    My lords,

    I agree that this appeal should be dismissed and I wish to add only a few
    brief observations of my own. It is undisputed that the river on the banks
    of which stands the Appellants' Mount Sion Works was polluted by con-
    taminated effluent which flowed from those works into the river. The vital
    question is whether the Appellants caused that pollution within the meaning
    of section 2 (1) of the Rivers (Prevention of Pollution) Act 1951. The nature
    of causation has been discussed by many eminent philosophers and also by a
    number of learned judges in the past. I consider, however, that what or who
    has caused a certain event to occur is essentially a practical question of fact
    which can best be answered by ordinary commonsense rather than abstract
    metaphysical theory.

    It seems to me that, giving the word " cause " its ordinary and natural
    meaning, anyone may cause something to happen, intentionally or negligently
    or inadvertently without negligence and without intention. For example, a
    man may deliberately smash a porcelain vase ; he may handle it so negligently
    that he drops and smashes it; or he may without negligence slip or stumble
    against it and smash it. In each of these examples, no less in the last than in
    the other two, he has caused the destruction of the vase.

    The Appellants clearly did not cause the pollution intentionally and we
    must assume that they did not do so negligently. Nevertheless, the facts so
    fully and clearly stated by my noble and learned friend Viscount Dilhorne to
    12

    my mind make it obvious that the Appellants in fact caused the pollution.
    If they did not cause it, what did? There was no intervening act of a third
    party nor was there any act of God to which it could be attributed. The
    Appellants had been responsible for the design of the plant; everything
    within their works was under their control; they had chosen all the equip-
    ment. The process which they operated required contaminated effluent being
    pumped round their works until it came to rest in an open tank which they
    sited on the river bank. If the pumps which they had installed in this tank
    failed to operate efficiently the effluent would necessarily overflow into the
    river. And that is what occurred. It seems plain to me that the Appellants
    caused the pollution by the active operation of their plant. They certainly did
    not intend to cause pollution but they intended to do the acts which caused it.
    What they did was something different in kind from the passive storing of
    effluent which could not discharge into the river save by an act of God or, as
    in Impress (Worcester) Ltd. v. Rees [1971] All E.R. 357 by the active inter-
    vention of a stranger, the risk of which could not reasonably have been
    foreseen.

    The Appellants relied strongly upon Moses v. Midland Railway Company
    31 T.L.R. 440. In that case a private owner's tank wagon filled with creosote
    formed part of a train being driven by the defendants. At the beginning of
    the journey the wagon was subjected to careful examination by the defendants
    which revealed no defect. There was, however, a latent defect in one of its
    taps. Whilst the train was travelling along the banks of a river this defect
    caused creosote to leak into the river and polluted it so that many fish were
    killed. On a charge under section 5 of the Salmon Fisheries Act, 1861, the
    justices held that the defendants had not caused the pollution, and that
    decision was upheld by the Divisional Court. The facts were strikingly
    different from those of the present case. The wagon was not owned by the
    defendants., they were in no way responsible for its design or maintenance;
    they exercised no control over the defective tap ; and they had no knowledge
    or means of knowledge of the latent defect which caused the leak. The
    decision, which to my mind is not relevant to this appeal, may well have
    been correct on its facts although the judgments as reported are not very
    satisfactory.

    The Appellants contend that even if they caused the pollution still they
    should succeed since they did not cause it intentionally or knowingly or
    negligently. Section 2(1)(a) of the Rivers (Prevention of Pollution) Act, 1951,
    is undoubtedly a penal section. It follows that if it is capable of two or
    more meanings then the meaning most favourable to the subject should be
    adopted. Accordingly, so the argument runs, the words " intentionally " or
    " knowingly " or " negligently " should be read into the section immediately
    before the word " causes ". I do not agree. It is of the utmost public
    importance that our rivers should not be polluted. The risk of pollution,
    particularly from the vast and increasing number of riparian industries, is
    very great. The offences created by the Act of 1951 seem to me to be
    prototypes of offences which " are not criminal in any real sense, but are
    " acts which in the public interest are prohibited under a penalty ", Sherras
    v. De Rutzen
    [1895] 1 QB 918 per Wright J. at p. 922 referred to with
    approval by my noble and learned friends, Lord Reid and Lord Diplock, in
    Sweet v. Parsley [1970] AC 132 at pp. 149 and 162. I can see no valid
    reason for reading the word " intentionally ", " knowingly " or " negligently "
    into section 2(l)(a) and a number of cogent reasons for not doing so. In the
    case of a minor pollution such as the present, when the justices find that
    there is no wrongful intention or negligence on the part of the defendant, a
    comparatively nominal fine will no doubt be imposed. This may be regarded
    as a not unfair hazard of carrying on a business which may cause pollution
    on the banks of a river. The present Appellants were fined £20 and ordered
    to pay in all £24 costs. I should be surprised if the costs of pursuing this
    appeal to this House were incurred for the purpose of saving these Appellants
    £43.

    If this appeal succeeded and it were held to be the law that no conviction
    could be obtained under the Act of 1951 unless the prosecution could dis-
    charge the often impossible onus of proving that the pollution was caused

    13

    intentionally or negligently, a great deal of pollution would go unpunished
    and undeterred to the relief of many riparian factory owners. 'As a result,
    many rivers which are now filthy would become filthier still and many rivers
    which are now clean would lose their cleanliness. The Legislature no doubt
    recognised that as a matter of public policy this would be most unfortunate.
    Hence section 2(1)(a) which encourages riparian factory owners not only to
    take reasonable steps to prevent pollution but to do everything possible to
    ensure that they do not cause it.

    I do not consider that the Appellants can derive any comfort (as they
    seek to do) from the inclusion in section 2(l)(a) of the words "knowingly
    " permits" nor from the deeming provision against local authorities in
    relation to sewage escaping into a river from sewers or sewage disposal units.
    The creation of an offence in relation to permitting pollution was probably
    included in the section so as to deal with the type of case in which a man
    knows that contaminated effluent is escaping over his land into a river and
    does nothing at all to prevent it. The inclusion of the word " knowingly "
    before " permits " is probably otiose and, if anything, is against the Appel-
    lants, since it contrasts with the omission of the word " knowingly " before
    the word " causes". The deeming provision was probably included to
    meet what local authorities might otherwise have argued was a special case
    and cannot, in my opinion, affect the plain and unambiguous general meaning
    of the word " causes ".

    For these reasons I would dismiss the appeal with costs.

    324604 Dd 197074 100 4/72 St.S.


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