Such a breach of condition as is mentioned in section 45, constituted by an act or omission for which the holder of the licence is liable to any punishment imposed by or under any enactment other than that section, does not render the holder of the licence guilty of an offence under that section.
Such a breach of condition as is mentioned in section 45 does not render the holder of the licence guilty of an offence under that section unless it was the later, or a later, of two or more such breaches, occurring within a period of 12 months, of conditions either of that licence or of that licence and a former licence by way of renewal of which that licence was granted, and was committed either—
In the case of any prosecution in respect of such a breach of condition as is mentioned in section 45 which would otherwise render the holder of the licence guilty of an offence under that section, it is a defence for him to prove the following matters (either as to that breach, or as to the earlier breach relied on for the purpose of subsection (2) of this section, unless it is one under which he has been convicted of such an offence)—
Section 47 applies for the interpretation of this section.