"(1) This section applies where a court- (a) proposes to impose a custodial sentence for a sexual or violent offence committed on or after30th September 1998 ; and. (b) considers that the period (if any) for which the offender would, apart from this section, be subject to a licence would not be adequate for the purpose of preventing the commission by him of further offences and securing his rehabilitation. (2) Subject to subsections (3) to (5) below, the court may pass on the offender an extended sentence, that is to say, a custodial sentence the term of which is equal to the aggregate of- (a) the term of the custodial sentence that the court would have imposed if it had passed a custodial sentence otherwise than under this section ('the custodial term'); and. (b) a further period ('the extension period') for which the offender is to be subject to a licence and which is of such length as the court considers necessary for the purpose mentioned in subsection (1) above."
"(1) This section applies to a person if- (a) he has been serving a determinate sentence of imprisonment which he began serving on or after1st October 1992 ; (b) he is released underPart II of the Criminal Justice Act 1991 (early release of prisoners); (c) before the date on which he would (but for his release) have served his sentence in full, he commits an offence punishable with imprisonment ('the new offence'); and. (d) whether before or after that date, he is convicted of the new offence. (2) Subject to subsection (3) below, the court by or before which a person to whom this section applies is convicted of the new offence may, whether or not it passes any other sentence on him to be returned to prison for the whole or any part of the period which- (a) begins with the date of the order; and. (b) is equal in length to the period between the date on which the new offence was committed and the date mentioned in subsection (1(c) above."
"(3) Where a person has been sentenced to two or more terms of imprisonment which are wholly or partly concurrent and do not fall to be treated as a single term, the date mentioned in section 116(1)(c) above shall be taken to be that on which he would (but for his release) have served each of the sentences in full. (5) Section 116(1) and subsection (3) above shall each have effect as if the term of an extended sentence (within the meaning of section 85 above) included the extension period (within the meaning of that section)."