C16.—(1) A member shall specify in a notice of election to make additional periodical payments under regulation C13 or C14 the birthday (“the specified birthday”) up to which additional payments are to be paid, which may be—
(a)his 65th birthday, or
(b)any earlier birthday which is or is after his NRD.
(2) Such additional periodical payments are to be paid, at such intervals as the Committee may determine, from the member’s next birthday after the date of the election.