"As soon as a long-term prisoner has served two-thirds of his sentence, it shall be the duty of the Secretary of State to release him on licence."
"'long-term prisoner' means a person serving a sentence of imprisonment for a term of four years or more."
"If recommended to do so by the Board in the case of a long-term ... prisoner who has been released on licence under this Part, the Secretary of State may revoke his licence and recall him to prison."
"The Secretary of State may revoke the licence of any such person and recall him to prison without a recommendation by the Board, where it appears to him that it is expedient in the public interest to recall that person before such a recommendation is practicable."
"(1) No one shall be held guilty of any criminal offence on account of any act or omission which did not constitute a criminal offence under the national or international law at the time when it was committed. Nor shall a heavier penalty be imposed than the one that was applicable at the time the criminal offence was committed."
"'existing prisoner' means any person who, at that commencement [ie the commencement of the Act on1 October 1992 ] is serving a custodial sentence."
"In relation to an existing prisoner ... whose sentence is for a term of more than twelve months- "(a) ... "(b) sections 33(3) and section 37(1) of this Act shall apply as if the reference to three-quarters of his sentence were a reference to two-thirds of that sentence."
"The Secretary of State may also give to the Board directions as to the matters to be taken into account by it in discharging any functions under this Part or in Chapter II; and in giving any such directions the Secretary of State shall in particular have regard to- "(a) the need to protect the public from serious harm from offenders; and "(b) the desirability of preventing commission by them of further offences and of securing their rehabilitation."
"They are the classification of proceedings in domestic law; the nature of the offence; and the nature and degree of severity of the penalty that the person concerned risked incurring ...