"If the deferred pensioner stopped being an active member more than a year before his normal retirement date, any part of his pension in excess of his guaranteed minimum pension will be increased in respect of the period between the date the deferred pensioner ceased to be an active member and his normal retirement date, in accordance with whichever of the methods set out in (a), (b) and (c) below would produce a higher pension. The alternative methods of revaluation referred to above are: (a) the percentage applicable to the deferred pensioner specified in the last order made by the Secretary of State under section 52A of the Pensions Act, to come into force before the deferred pensioner's normal retirement date; (b) at the rate or rates at which pensions in payment from the main fund have been increased during the relevant period."