Section 51 Supplementary powers to make regulations.

as to the procedure to be followed with respect to—

extending the categories of case to which section 16, 17 or 20 applies;

as to the date on which an application for a F4maintenance calculation is to be treated as having been made;

for attributing payments made under maintenance calculations to the payment of arrears;

for the adjustment, for the purpose of taking account of the retrospective effect of a maintenance calculation, of amounts payable under the calculation;

for the adjustment, for the purpose of taking account of over-payments or under-payments of child support maintenance, of amounts payable under a maintenance calculation;

as to the evidence which is to be required in connection with such matters as may be prescribed;

as to the circumstances in which any official record or certificate is to be conclusive (or in Scotland, sufficient) evidence;

with respect to the giving of notices or other documents;

for the rounding up or down of any amounts calculated, estimated or otherwise arrived at in applying any provision made by or under this Act.