12.—(1) A group that determines an appeal must make an order requiring the payment to the CMA of the costs incurred by the CMA in connection with the appeal.N.I.
(2) An order under sub-paragraph (1) must require those costs to be paid—
(a)where the appeal is allowed in full, by the Authority;
(b)where the appeal is dismissed in full, by the appellant;
(c)where the appeal is partially allowed, by one or more parties in such proportions as the CMA considers appropriate in all the circumstances.
(3) The group that determines an appeal may also make such order as it thinks fit for requiring a party to the appeal to make payments to another party in respect of costs reasonably incurred by that other party in connection with the appeal.
(4) A person who is required by an order under this paragraph to pay a sum to another person must comply with the order before the end of the period of 28 days beginning with the day after the making of the order.
(5) Sums required to be paid by an order under this paragraph but not paid within the period mentioned in sub-paragraph (4) shall bear interest at such rate as may be determined in accordance with provision contained in the order.
(6) Any costs payable by virtue of an order under this paragraph and any interest that has not been paid may be recovered as a civil debt by the person in whose favour that order is made.]