"non-parole period" means a period specified under section 19, 20(1), 22(1)(b) or 23(1).
Section 25 of that Act provides as follows:
In this Division and in any parole order, a reference to a non-parole period, in relation to a prisoner, is a reference to the non-parole period reduced by the period, if any, by which the non-parole period is required to be reduced in relation to the prisoner by or in accordance with the regulations.
Regulation 18 of the Probation and Parole Regulation 1984 N.S.W. provides that the period, if any, by which a non-parole period is required to be reduced in relation to a prisoner pursuant to s. 25 of that Act is to be determined in accordance with a formula which is set out in that regulation. Before the effect of the formula is explained, it is necessary to refer to the provisions of the Prisons Act 1952 N.S.W., as amended, which deal with remissions of sentences. By s. 41(3) of that Act, prisoners are to be granted remissions of sentences as prescribed by the Regulations under that Act. The relevant regulations are contained in Pt XV of the Prisons Regulations 1968 N.S.W.. By reg. 110, which appears in that Part, it is provided that subject to that Part a convicted prisoner shall be entitled to remission in accordance with the following provisions, inter alia: