15.—(1) On a final determination of fees, regulations 5(2) and 17 apply notwithstanding that a payment has been made under regulation 14.
(2) Where the amount found to be due under regulation 17 in respect of a disbursement is less than the amount paid under regulation 14 (“the interim payment”), the appropriate officer must deduct the difference from the sum otherwise payable to the litigator on the determination of fees, and where the amount due under regulation 17 exceeds the interim payment, the appropriate officer must add the difference to the amount otherwise payable to the litigator.