(2)  The party liable to pay the costs of the proceedings which gave rise to the taxation proceedings may make a written offer to pay a specific sum in satisfaction of those costs which is expressed to be “without prejudice except as to the costs of taxation” at any time before the expiration of 7 days after the delivery to him of a copy of the bill of costs under Rule 22 and, where such an offer is made, the fact that it has been made shall not be communicated to the Registrar until the question of the costs of the taxation proceedings falls to be decided.

(3)  The Registrar may take into account any offer made under paragraph (2) which has been brought to his attention.