(1) Where:
(a) pension is payable to or in respect of a contributor who ceases to be a member (whether by reason of retirement or death) after the commencement of this section; and
(b) the category number of the contributor immediately before he ceases to be a member is less than the prescribed number applicable to him under subsection (2);
the rate of the pension shall, notwithstanding anything contained in this Act, be not less than the rate of pension that would have been payable if his category number had, immediately before he ceased to be a member, been the same as the prescribed number so applicable to him.
(2) For the purposes of this section, the prescribed number applicable to a contributor is:
(a) if the contributor is a male--17 or, if another number is specified in the regulations as the number applicable for the purposes of this section to male members who cease to be members on the date on which the contributor ceased to be a member, that other number; or
(b) if the contributor is a female--13 or, if another number is specified in the regulations as the number applicable for the purposes of this section to female members who cease to be members on the date on which the contributor ceased to be a member, that other number.