In regulation 5A of the principal Regulations (date from which a decision revised under section 16 of the Child Support Act takes effect) —
(a) for paragraph (2)(b) there shall be substituted—
(b) the total amount of child support maintenance which would be fixed for the relevant period by the decision which is treated as a decision made under section 11 of the Child Support Act is greater than the total amount of child support maintenance which was fixed for that period by the decision made under section 12(1) of the Child Support Act (whether as originally made, or as revised or superseded under sections 16 or 17 of that Act respectively, or decided on appeal).
(b) after paragraph (2)(b) there shall be added—
(3) For the purposes of paragraph (2)(b), “the relevant period” means the period during which the decision under section 12(1) of the Child Support Act (whether as originally made, or as revised or superseded under sections 16 or 17 of that Act respectively, or decided on appeal) applied.