277.—(1) The pension payable under Part 3 shall be reduced in accordance with Chapter 8 but with the following modifications—
(a)relevant income shall include the enhancement amount determined under regulation 118(2); and
(b)where a practitioner becomes entitled to receive a pension under Part 3 and in the 12 months preceding the date on which the member becomes so entitled also held concurrent pensionable employment as an officer, the member's previous earnings in respect of the member's practitioner service shall be increased by the amount of the member's previous pay in respect of the member's officer service.
(2) Where the reduction applied under the modified Part 3 is not the full amount of the excess determined under that modified Part, such part of the excess as has not given rise to a reduction in the old service pension in Part 3 shall be the excess for the purposes of regulation 117(3).