Sch 20B para 8
(1) As soon as a person to whom paragraph 7 applies has served one-half of the custodial term, it is the duty of the Secretary of State to release the person on licence under this paragraph. (2) Sub-paragraph (1) applies in place of section 243A or 244, as the case may be (release of prisoners serving less than 12 months, or serving 12 months or more).