9.—(1) The reference in Article 11(2)(b) to a person being an employed earner for the purposes of the Social Security Contributions and Benefits (Northern Ireland) Act 1992 in respect of whom a secondary Class 1 contribution was payable under that Act (whether or not it was in fact paid) shall be construed—N.I.
(a)as respects a week of employment after 1st June 1976 and before 1st July 1992, as a reference to a person being an employed earner for the purposes of the Social Security (Northern Ireland) Act 1975 in respect of whom a secondary Class 1 contribution was payable under that Act (whether or not it was in fact paid), and
(b)as respects a week of employment after 6th April 1975 and before 1st June 1976, as a reference to a person being an employed earner for the purposes of the Social Security (Northern Ireland) Act 1975.
(2) The references in paragraph (4) of Article 11 to the Social Security Contributions and Benefits (Northern Ireland) Act 1992 include the Social Security (Northern Ireland) Act 1975; and that paragraph applies to any question arising whether an employer's contribution was or would have been payable as mentioned in sub-paragraph (1).