29.—(1) If no annual sum is payable to the widow, child or other dependant of any person under regulation 27 and no sum is payable under regulation 28 and the person dies before he has received in the aggregate by way of retirement compensation a sum equivalent to the amount of any contributions repaid by him under regulation 25, together with compound interest thereon calculated at the rate of 3 per cent. per annum with half-yearly rests up to the date of his death as from the 1st April or 1st October following the half year in which the amount was paid, there shall be paid to his personal representatives the difference between the aggregate amount received by way of retirement compensation as aforesaid and the said equivalent sum.
(2) If an annual sum becomes payable to a widow under regulation 27 and on her re-marriage or death the sum ceases to be payable, and any sum payable to a child or other dependant under that regulation has ceased to be payable, and if the aggregate amount of the payments which were made as aforesaid to her husband by way of retirement compensation and to the widow or personal representatives under regulation 28 is less than a sum equivalent to the amount which would have been payable to the personal representatives under that regulation if no annual sum had been payable under regulation 27, there shall be paid to her or her personal representatives the difference between such aggregate amount and the said equivalent sum.
(3) For the purposes of this regulation a person who has surrendered any part of his retirement compensation under regulation 20(6) shall be deemed to have received during any period the amount of compensation for that period which he would have received but for any such surrender.