19. Calculation where change of circumstances in premium period

(1) If the circumstances that formed the basis on which the subsidy payable to a member was calculated change during a premium period, the subsidy payable to the member must be recalculated having regard to those changed circumstances.

(2) If a member is eligible during part of a premium period in one category (after taking account of subsection 18 (3)) and then changes to another category during another part of the premium period so that a different amount of subsidy applies (after taking account of subsection 18 (3)), the total subsidy payable to the member for the whole of the premium period is the sum of the amounts calculated for each part of the premium period.