18.—(1) Subject to this regulation and regulation 19, any determination under regulation 15 or regulation 16 is final.
(2) Any party with a financial interest in an assessment of the full costs may appeal against that assessment if, and to the extent that, the party would but for this Part be entitled to appeal against an assessment of costs by the court in which the relevant proceedings are taking place.
(3) Where the court has under regulation 15(2)(a) specified an amount which a legally aided party is required to pay under a section 26(1) costs order, the legally aided party may apply to the court for a determination of the full costs.
(4) If, on a determination under paragraph (3), the amount of the full costs is less than the amount which the court previously specified under regulation 15(2)(a), the legally aided party must instead be required to pay the amount of the full costs.
(5) The receiving party or the Lord Chancellor may appeal, on a point of law, against the making of a costs order against the Lord Chancellor (including the amount of costs which the Lord Chancellor is required to pay under the order), or, in the case of the receiving party, against the court’s refusal to make such an order.