Where a member spouse is entitled to additional retirement benefit under a defined benefit scheme by virtue of the payment of additional voluntary contributions, the designated benefit in respect of such retirement benefit shall be calculated in accordance with the following formula:
(X x Y x P) / Z
X = the amount of additional retirement benefit payable to, or in respect of, the member spouse by virtue of making additional voluntary contributions;
Y = the period of retirement benefit service during which the member spouse has paid additional voluntary contributions which falls within the relevant period;
Z = the total period of retirement benefit service during which the member spouse has paid additional voluntary contributions;
P = the relevant percentage.
Provided that where the rate at which the member spouse has made additional voluntary contributions has altered at any time after the date of the decree, the value "X" in the formula shall be based on the amount of additional retir
…