4.—(1) This Part shall apply in the case of a person who—
(a)on 1st April 1978 or, where he died before that date, immediately before his death, was serving as a regular policeman or, having ceased so to serve, had retired with an entitlement to a pension; and
(b)was on 1st April 1978, or immediately before his retirement or death if earlier, entitled to reckon pensionable service for the purposes of the principal Regulations or, as the case may be, the old cases Regulations by virtue of
(c)was not on 1st April 1978, or immediately before his retirement or death if earlier, entitled to reckon pensionable service in respect of qualifying service under the war service provisions of the pension scheme applicable thereto but who would have been so entitled if he had remained in that scheme until 1st April 1978, or the date of his death if earlier;
so, however, that in the case of a regular policeman with more than one period of qualifying service, any such period other than the first shall be disregarded for the purposes of this Regulation and references to his qualifying service shall be construed accordingly.
(2) In relation to such a policeman, in these Regulations references to the war service provisions of a pension scheme are references to the provisions of the scheme analogous to those of the 1979 Regulations, and “war service”
(3) The appropriate police authority may require that any claim that a regular policeman satisfies the condition referred to in paragraph (1)(c), and as to the duration of his war service, be supported by a certificate given by or on behalf of the person responsible for the management of the pension scheme appropriate to his qualifying service, and the police authority shall be entitled to rely upon a certificate so given.