5.—(1) Subject to the following provisions of this Regulation, the 1979 Regulations shall apply in the case of a regular policeman to whom this Part applies as if references in those Regulations to a qualified policeman were references to a regular policeman to whom this Part applies.
(2) Where a regular policeman to whom this Part applies elects only as mentioned in Regulation 8(1) of the 1979 Regulations, the principal Regulations or, as the case may be, the old cases Regulations shall have effect as though he had been entitled, immediately before his retirement (or death while serving) to reckon an additional period of pensionable service equal to the following proportion of his war service, namely—
(a)47.75% thereof, where the qualifying service is fire service or Northern Ireland police or fire service;
(b)35.25% thereof, where the qualifying service is National Health Service or service in health and personal social services in Northern Ireland, or local government service or Northern Ireland local government service; and
(c)34.875% thereof, where the qualifying service is teaching service or Northern Ireland teaching service.
(3) Where a policeman so elects, his pension shall, notwithstanding the preceding paragraph, be deemed for the purposes excepted in the said Regulation 8(1) to be the pension to which he would be entitled without his additional period of pensionable service under that paragraph, save that that period shall count for the purposes of Part II of Schedule 3 to the old cases Regulations (preserved rate of widow's pension calculated by reference to the husband's pensionable service).