D12.—(1) A person who—
(a)has become a pensionable employee by virtue of an election under paragraph 1(1) of Part III of Schedule 2 made before 1st October 1990 or by virtue of paragraph 4 of that Part; or
(b)has become a pensionable employee in a whole-time employment at any time after 31st March 1974 and before 1st October 1990 and had previously been in a part-time employment under a scheduled body, is entitled to reckon as qualifying service in relation to the employment in which he is a pensionable employee any previous period of employment under a scheduled body after the material date, except a period which was followed by one of 12 months or more during which he was not employed by a scheduled body.
(2) The material date is the earliest date from which, if Part III of Schedule 2 had come into force on 1st April 1974, an election or, as the case may be, a deemed election by him could have had effect.