C13. A person’s right to a payment under regulation C12 is extinguished if—
(a)he returns to local government employment after leaving previous local government employment with a right to such a payment, and
(b)on the date on which he returns to local government employment he has not received the payment, and
(c)he has not given, within 3 months after that date or such longer period as his previous fund authority and, if different, his new fund authority may allow, written notice to his previous fund authority that he wishes to receive an immediate payment.