(1)If the length of a sentence is treated as reduced by a period of custody in accordance with section 26 of the M1Treatment of Offenders Act Northern Ireland) 1968 (duration of sentence) for the purposes of section 4(1) above the period of custody must be treated as having been served as part of the sentence.
(2)If a sentence of at least five years is supplemented by a period of imprisonment in accordance with section 16(2) of the M2Northern Ireland (Emergency Provisions) Act 1996 (conviction of scheduled offence during period of remission) for the purposes of section 4(1) above the supplementary period must be treated as part of the sentence.
(3)If—
(a)a sentence of less than five years is supplemented by a period of imprisonment in accordance with section 16(2) of the 1996 Act, and
(b)the supplementary period relates to an earlier sentence of at least five years for a qualifying offence (within the meaning of section 3 above),
the prisoner may make an application under section 3 in respect of the supplementary period and the application shall be granted if (and only if) the second and third conditions are satisfied.
(4)References in this section to section 16(2) of the 1996 Act include references to—
(a)section 23(2) of the M3Prevention of Terrorism (Temporary Provisions) Act 1989, and
(b)section 15(2) of the M4Northern Ireland (Emergency Provisions) Act 1991.