20. A whole-time or part-time pensionable officer who, under the pension scheme to which he was last subject before suffering loss of office, would have been entitled on becoming entitled to a pension to surrender a part thereof in favour of his spouse or any dependant of his, may, if he so desires and informs the determining authority by notice in writing accordingly within one month after attaining normal retiring age, surrender on the like terms and conditions as on the surrender of part of a pension such part of the annual sum awarded by way of compensation under paragraph 13 of this Schedule, and the paying authority may grant to the spouse or any other dependant of the officer a pension of such value as would be the case were the annual sum a pension to which he had become entitled under the said pension scheme.