4.A.1.—(1) This Part applies where a member has pensionable service under both Part 2 and Part 3.
(2) Where this Part applies, Part 2 and Part 3 are subject to the modifications provided in this Part.
(3) As regards a person to whom the general rule in regulation 2.G.2 (general rule: separate treatment of service etc.) or regulation 3.G.2 (general rule: separate treatment of service etc.) applies, this Part applies separately to benefits in respect of the earlier service and the later service (as defined in regulation 2.G.1 (application of Chapter 2.G) or regulation 3.G.1 (application of Chapter 3.G), as appropriate).