"(1) An extended sentence of imprisonment is available in respect of an offence where— (a) the offence is a specified offence (see section 306(1)), (b) the offender is aged 21 or over when convicted of the offence, (c) the court is of the opinion that there is a significant risk to members of the public of serious harm occasioned by the commission by the offender of further specified offences (see section 308), (d) the court is not required by section 283 or 285 to impose a sentence of imprisonment for life, and (e) the earlier offence condition or the 4-year term condition is met... (3) The earlier offence condition is that, when the offence was committed, the offender had been convicted of an offence listed in Schedule 14. (4) The 4 year term condition is that, if the court were to impose an extended sentence of imprisonment, the term that it would specify as the appropriate custodial term (see section 281) would be at least 4 years."
"... the term of imprisonment that would be imposed in respect of the offence in compliance with section 231(2) (length of discretionary custodial sentences: general provision) if the court did not impose an extended sentence of imprisonment."
"The custodial sentence must be for the shortest term (not exceeding the permitted maximum) that in the opinion of the court is commensurate with the seriousness of— (a) the offence, or (b) the combination of the offence and one or more offences associated with it."
"The result is that the legislation enables a court in passing a sentence in relation to offence A to take into account in specifying the appropriate custodial term for that offence an associated offence B. Seriousness when sentencing offence A can have added complexion from an associated offence. The principle can be applied to extended sentences. Even though specified offence A by itself may not justify an appropriate custodial term of 4 years, when aggregated with associated offence B the totality of offending does. Aggregation in this way is subject to the custodial term for offence A not exceeding the statutory maximum and not infringing the principle of totality. Importantly, in the context of extended sentences the aggregate of the custodial term and the extension period for offence A must not exceed the maximum sentence for the offence ... "
"Thus the statutory language of section 153 points to the court being able to aggregate with a specified offence non specified associated offences, to consider the totality of offending, when fixing the custodial term of an extended sentence under section 227 ... the language of section 227(2B) is such that the appropriate custodial term in relation to each extended sentence must be at least 4 years. Separate consecutive sentences, each shorter than 4 years, cannot be extended even if their total is more than 4 years."
"46. The guidance which the Registrar invites us to give regarding extended sentences is as follows. It assumes that the offender is convicted of offences at least one of which is specified in Schedule 15; that he is dangerous; that a life sentence is not required; and that he has not previously committed one of the grave offences spelt out in Schedule 15A. It also assumes that the offences are associated offences, which will be the case if he is convicted of them at the same time, sentenced for them at the same time, or admits them when sentenced for other offences and asks for them to be taken into account. In other words, the key issue on these assumptions is whether the condition for imposing an extended sentence ... is met, namely, whether the appropriate custodial term is four years. 47. If no one offence would justify a four year custodial term on ordinary principles, the seriousness of the aggregate offending must be considered. If a four year custodial term results from aggregating the shortest terms commensurate with the seriousness of each offence, then that four year term can be imposed in relation to the specified offence ... "
"41. We disagree. Such an approach might have been legitimate ... if all or any of the other offences had been specified offences. But, in the absence of other such offences, before considering dangerousness, the judge had to conclude that a sentence for the one specified offence of not less than four years was appropriate. We can distil no principle from the authorities which entitles a judge to uplift a sentence for a stand-alone specified offence in order to justify the imposition of an extended sentence ... "