4. After rule C9 the following rule shall be inserted—
C10. Where a pension debit member dies leaving a surviving spouse, any award under rule C1, C4, C5, C6, C7 or C8, and the pension under any of those rules by reference to which any payment under rule C9 is made, is calculated by reference to the member’s rights under this Scheme as reduced by virtue of section 31 of the 1999 Act and in accordance with such tables and other guidance as are provided for the purpose by the Government Actuary.”.