(1) The amount payable under the earlier maintenance assessment shall be the amount due under a fresh assesssment made following a review of that earlier maintenance assessment under section 16, 17, 18 or 19 of the 1991 Act where—
(a) the review and fresh assessment were made after the prescribed change in child support legislation referred to in section 24(1) of the 1995 Act has come into force but before the revised assessment is made;
(b) that review is on grounds other than that prescribed change in legislation; and
(c) the effective date of that fresh assessment is prior to the effective date of the revised assessment.
(2) Subject to paragraph (4) where, after a revised assessment has been made, a child support officer makes a fresh assessment following a review of the earlier maintenance assessment under section 16, 17, 18 or 19 of the 1991 Act, for the purposes of the calculation of a compensation payment under section 24 of the 1995 Act the amount payable under the earlier maintenance assessment shall be that payable under that assessment prior to that review.
(3) Subject to paragraph (4), where a revised assessment is reviewed on the grounds set out in section 18(6) or 19(2) of the 1991 Act, and a fresh assessment of a different amount is made, the effective date of which is the same as that of that revised assessment, the compensation payment calculated under section 24 of the 1995 Act, shall be recalculated using the amount due under that fresh assessment in place of the amount due under the revised assessment.
(4) In cases where the circumstances set out in paragraphs (2) and (3) both apply, the compensation payable under section 24 of the 1995 Act shall be recalculated using the amount due under the fresh assessments referred to in those paragraphs.
(5) Where the circumstances set out in paragraph (6) apply, the compensation payable under section 24 of the 1995 Act for the period of the further award shall be calculated in accordance with the following formula—
where C and A have the meaning given to them in regulation 4.
(6) The circumstances referred to in paragraph (5) are—
(a) the effective date of a revised assessment is not more than 4 weeks in the case of family credit or 6 weeks in the case of disability working allowance prior to the date upon which the existing award of that benefit ends;
(b) the person to whom that award was made has applied for a further award of that benefit to be paid from the date of expiry of the existing award;
(c) the amount payable under the further award has not taken account of the changes in child support legislation referred to in regulation 2 which are relevant to the further award.
(7) For the purposes of paragraph (6), the existing award means the award of family credit or disability working allowance in force at the effective date of the revised assessment and the further award means the award of family credit or disability working allowance made after the existing award has expired.