55.—(1) A police officer to whom regulation 53(1) applies may, within twelve months of the date when he last began to serve as such, elect under that regulation to make payment by a lump-sum of such amount calculated by the Board, in accordance with tables prepared by the Scheme actuary, as is necessary to purchase the added years specified in the notice of election.
(2) A lump-sum payment under this regulation shall be made within three months of the date on which the notice of election is given and, if it is not so made, the election shall be deemed for the purposes of these Regulations never to have been made.
(3) A sum held in another pension scheme may not be used to purchase added years under this regulation.