A person is guilty of an offence against this Act who, without lawful authority or excuse, proof of which shall lie on him—
(a)does anything in contravention of this Act, or of an order of the Minister, or of a regulation of a local authority; or
(b)fails to give, produce, observe or do any notice, licence, rule or thing which by this Act or such an order or regulation he is required to give, produce, observe or do.