Section 60

In any proceedings for an offence under this Act or any regulation made thereunder consisting of a failure to comply with a duty or requirement to do something so far as is practicable, or to use the best practicable means to do something, it shall be for the accused to prove that it was not practicable to do more than was in fact done to satisfy the duty or requirement, or that there was no better practicable means than was in fact used to satisfy the duty or requirement.