1.—(1) The part of the retirement pension surrendered on any occasion—
(a)must be an exact number of pounds, and
(b)must secure for the beneficiary a pension of at least £39 per annum.
(2) The surrendered part must not, together with any parts previously surrendered—
(a)exceed the lower of—
(i)the amount which would result in the reduction of the retirement pension to less than the rate of the pension which would become payable to the beneficiary under this Schedule, or
(ii)one third of the retirement pension, or where regulation E14 (former teachers) applies one third of the retirement pension receivable after reduction under that regulation, or
(b)be of an amount which would result in the reduction of the retirement pension to less than any minimum rate of equivalent pension benefits applicable under the Insurance Acts, or
(c)where the person’s local government employment is or was contracted-out employment, be of an amount which would result in the retirement pension—
(i)becoming payable at an annual rate less than that obtained by multiplying one eightieth of his pensionable remuneration by the length in years of the whole period of his service in contracted-out employment, or
(ii)being, but for regulation E1(3), less than his guaranteed minimum if any.