Where an offence is committed against this Act by any person who is the agent or servant of a person licensed under this Act, or is otherwise subject to the supervision or instructions of a person so licensed, the person so licensed shall, without restricting the liability of the first-mentioned person, be liable under this Act in the same manner and to the same extent as if he had personally committed the offence:
Provided that, in any proceedings which are taken against a person licensed under this Act by virtue of this section, it shall be a defence for that person to prove that the offence was committed without his knowledge and that he exercised all due diligence to prevent the commission of the offence.
Compare: Radiation Protection Regulations 1951, reg 35