3. Where—
(a)at any time after 31st March 1974 a scheduled body decided that a person in a part-time employment under them was in that employment a pensionable employee; and
(b)he was not at that time a pensionable employee by virtue of the former regulations; and
(c)if Part II of Schedule 2 to the 1981 regulations had then been in force he could have made an election under paragraph 1(1), before its amendment by the Local Government (Superannuation) (Amendment) Regulations (Northern Ireland) 1991,
he is to be treated as if that Part had then been in force and he had made such an election.