393. The average salary method.

The average salary method is to revalue the member's1 salaries2 as respects the pre-pension period3 in any way in which they would have been revalued during that period if he had remained in the same pensionable service4. For these purposes those salaries are to be taken to include:


    (1)     any amount which is attributed to them, otherwise than by virtue of these provisions, as the result of a revaluation for which the rules of the scheme provide