(1)In section 140 a “period of pre-1948 insurance” means any period ending before 6 April 1948 to which subsection (2) applies by reference to any person (“the insured person”).
(2)This subsection applies to a period which is one of the following—
(a)a period for which the insured person at any time was, was deemed to be, or was treated as, insured under the Widows', Orphans' and Old Age Contributory Pensions Acts 1936 to 1941, or under any provision of Northern Ireland legislation corresponding to those Acts;
(b)a period for or in respect of which contributions of any class were credited to the insured person in accordance with the provisions of the National Insurance Act 1965 (c. 51) or regulations made under that Act, or in accordance with any provision of Northern Ireland legislation corresponding to that Act or such regulations;
(c)a period for which contributions are credited to the insured person by any provision of the Social Security (Widow's Benefit, Retirement Pensions and Other Benefits) (Transitional) Regulations 1979 (S.I. 1979/643), or by any provision of Northern Ireland legislation corresponding to a provision of those regulations.