If a member remains an employee after the normal retirement date, the Commission must pay to the member, on the member ceasing to be an employee, an amount equal to the sum of –

(a) the benefit that would have been payable at the normal retirement date in accordance with regulation 178 if the member had retired at that date; and

(b) any contributions made to the SFCS Scheme from the normal retirement date by the member or the Commission, less any amount deducted from that amount in accordance with regulation 163(5) ; and

(c) interest, on the amounts referred to in paragraphs (a) and (b) , at the interest rates.