10.—(1) This paragraph applies where a person is, in accordance with paragraph 7 of Schedule 5, continuing to pay contributions which he began to pay before 1973—
(a)before attaining the age of 60 ceases to be in pensionable employment; and
(b)does not then become entitled to payment of retirement benefits under regulation E4(4) or to a short service incapacity grant under regulation E17.
(2) The person is entitled to count as reckonable service
where—
A is the period in respect of which contributions are being paid;
B is the period during which they were paid; and
C is the period from the start of B to his 60th birthday.