The Costs Court constituted by a Costs Judge may exercise all the powers of the Costs Court constituted by a judicial registrar under Rule 63.56.2 if—
(a) at any time there is no holder of the office of judicial registrar in the Costs Court;
(b) the judicial registrar is absent or for some other reason unable to perform his or her duties; or
(c) for any other reason it is necessary or appropriate that a Costs Judge should exercise those powers.