128.—(1) Where the Board has made a determination under regulation 70 (employer initiated retirement) to pay an active member who has not attained normal pension age a pension calculated in accordance with regulation 68 (annual rate of retirement pension (active members)) the Board must pay the employer initiated retirement additional contribution.
(2) The amount of the employer initiated retirement additional contribution is calculated in accordance with actuarial guidance and that actuarial guidance must have regard to the difference between the pension that is payable under regulation 70 (employer initiated retirement) and the pension payable under regulation 68 (annual rate of retirement pension (active members)).