s 20 Offences committed by body corporate, etc.
20. Where an offence under this Act has been committed by a body corporate, a partnership or an unincorporated association of persons, any person who, at the time of the commission of the offence, was a director, manager, partner, secretary or other similar officer thereof, or who was purporting to act in any such capacity, shall also be guilty of that offence and shall be liable to be proceeded against and punished accordingly unless he proves —(a) that the offence was committed without his knowledge, consent or connivance; and (b) that he had exercised all such diligence to prevent the commission of the offence as he ought to have exercised having regard to the nature of his functions in that capacity and to all the circumstances.