2. Subject to paragraph 5, where—
(a)a person who is a married man has a period of membership before 1st April 1972; and
(b)a widow’s pension may become payable in respect of him under Part F,
the standard retirement grant (as increased in accordance with Part I of this Schedule, if appropriate) is reduced by two-eightieths of his pensionable remuneration, multiplied by the length in years of that period in membership.