"(2A) The condition in this subsection is that, at the time the offence was committed, the offender had been convicted of an offence specified in Schedule 15A."
"(2B) The condition in this subsection is that, if the court were to impose an extended sentence of imprisonment, the term that it would specify as the appropriate custodial term would be at least four years."
"In considering the seriousness of an offence committed by an offender who has one or more previous convictions, the court must treat each previous conviction as an aggravating factor if (in the case of that conviction) the court considers that it can reasonably be so treated having regard, in particular, to - (a) the nature of the offence to which the conviction relates and its relevance to the current offence, and (b) the time that has elapsed since the conviction."