39 .F1—(1) Without prejudice to Part V, no person shall pass or permit to be passed into, or into a drain connecting with, a sewer or sewage treatment works of the Ministry any matter or substance which, either alone or in combination with any matter or substance with which it is likely to come into contact while passing through any sewer or works, is likely to injure the sewer or works, or to interfere with the free flow of their contents, or to affect prejudicially the treatment or disposal of their contents or to be prejudicial to health.
(2) Where a person is charged with an offence under this Article it shall be a defence to prove that at the time he so passed or permitted to be passed the matter or substance in question he did not know, and could not reasonably be expected to know, that it would be likely to have the effects mentioned in paragraph (1).
(3) A person who contravenes this Article shall be guilty of an offence and liable—
(a)on conviction on indictment, to a fine;
(b)on summary conviction to a fine not exceeding[F2 level 5 on the standard scale] and a further fine not exceeding £40 for each day on which the offence continues after conviction thereof.