(1)    For the purposes of any reference in section 116(1) above (however expressed) to the term of imprisonment to which a person has been sentenced, consecutive terms and terms which are wholly or partly concurrent shall be treated as a single term if—

(a)    the sentences were passed on the same occasion; or

(b)    where they were passed on different occasions, the person has not been released under Part II of the Criminal Justice Act 1991 at any time during the period beginning with the first and ending with the last of those occasions;

but this is subject to subsection (4) below.

(2)    Where a suspended sentence of imprisonment is ordered to take effect, with or without any variation of the original term, the occasion on which that order is made shall be treated for the purposes of subsection (1) above as the occasion on which the sentence is passed.

(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.

(4)    Subsections (1) to (3) above apply only where one or more of the sentences concerned were passed on or after 30th September 1998; but where, by virtue of section 51(2) of the Criminal Justice Act 1991 as enacted, the terms of two or more sentences passed before 30th September 1998 have been treated as a single term for the purposes of Part II of that Act, they shall be treated as a single term for the purposes of section 116(1) above.

(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).