Until the coming into force of section 61 of CJCSA 2000, section 263 of AFA 2006 (restriction on imposing custodial sentence on unrepresented offender) has effect as if the actions mentioned in subsection (3)(a) included passing any custodial sentence (within the meaning of AFA 2006 as modified by this Schedule) on an offender who is aged under 21 on conviction.