Commentary on Sections Section 23: Transitional provision
Provides that sections 5 and 6 do not apply where any of the offences mentioned in the respective sections were committed before the commencement of the respective sections.  The same also applies in relation to offences mentioned in: paragraph (b) of section 2(3); paragraph (b) of section 4(2); sections 11(1)(a) and 12(1); and subsection (2) of section 18.