Section 63 Defence available to persons charged with offences.
It shall be a defence for a person charged with an offence arising out of—
(a)
a contravention of a provision either of this Act or of regulations thereunder; or
(b)
a failure to comply with any condition subject to which an exemption from any requirement of such a provision has been granted;
to prove that he used all due diligence to secure compliance with that provision or, as the case may be, that condition.