The provisions of Part III of these Regulations shall not apply to a case in which there is a maintenance assessment in force on the date they come into force unless the absent parent in relation to whom that assessment was made makes an application for a review of that assessment under section 17 of the Act.

Such an application must be made not later than 3 months after the date when these Regulations come into force, but if an application is made after that period it may be accepted if the Secretary of State is satisfied that there is good reason for its being made late.

Where a maintenance assessment is reviewed solely because of the coming into force of Part III of these Regulations the provisions of regulations 10(2) and 19 of the Procedure Regulations shall not apply in relation to that review but instead the child support officer shall notify to the relevant persons (as defined in regulation 1(2) of those Regulations) details of how the provisions of Part III of these Regulations have been applied in that case.

The provisions of the following paragraphs shall apply where there is a review of a previous assessment under section 17 of the Act (reviews on change of circumstances) at any time when the amount payable under that assessment is the transitional amount.

The child support officer shall, in determining the reviewed formula amount, apply the provisions of regulations 20 to 22 of the Procedure Regulations.

Where a child support officer reviews a maintenance assessment in consequence only of the amendments made by Part II of these Regulations he shall not make a fresh assessment if the difference between the amount of child support maintenance fixed by the assessment currently in force and the amount that would be fixed if a fresh assessment were to be made as a result of the review is less than £1.00 a week.

For the purposes of regulation 17(2) (intervals between periodical reviews and notice of a periodical review) and 31 (effective date of maintenance assessments following a review under sections 16 to 19 of the Act) of the Procedure Regulations, a review such as is mentioned in paragraph (1) above shall be disregarded.

Except in relation to the amendment made by regulation 4(8) above, notwithstanding anything in regulation 31 of the Procedure Regulations the effective date of a maintenance assessment such as is mentioned in paragraph (1) above shall be the date when these Regulations come into force.