12(1)In relation to an existing prisoner or licensee on the passing of whose sentence an extended sentence certificate was issued—
(a)section 33(3) of this Act shall apply as if the duty to release him unconditionally were a duty to release him on licence; and
(b)section 37(1) of this Act shall apply as if the reference to three-quarters of his sentence were a reference to the whole of that sentence.
(2)In this paragraph “extended sentence certificate” means a certificate issued under section 28 of the 1973 Act stating that an extended term of imprisonment was imposed on an offender under that section.