42.—(1) A member of the rank of constable shall be entitled to reckon for the purposes of pay for that rank any period of service in a constabulary mentioned in paragraph (2).
(2) The constabularies referred to in paragraph (1) are—
(a)the Ministry of Defence Police, that is to say the force established by section 1 of the Ministry of Defence Police Act 1987(1) or, before the coming into force of that Act, comprising constables appointed under section 3 of the Special Constables Act 1923(2) on the nomination of the Defence Council or, before 1st April 1964, of the Admiralty, Army Council or Air Council;
(b)the Port of Tilbury Constabulary or, before the coming into force of the Port of Tilbury Transfer Scheme 1991 Confirmation Order 1992(3), the Port of London Authority’s police force, that is to say the force of constables appointed under section 154 of the Port of London Act 1968(4);
(c)the persons appointed to execute the office of constable within the ports of Larne and Belfast under section 79 of the Harbour, Docks and Piers Clauses Act 1847(5).