7.21.—(1) Subject to paragraph (2), any party to matrimonial or civil partnership proceedings may be heard on any question as to costs at the hearing of the proceedings.
(2) In the case of a hearing following a direction under rule 7.20(2)(a), a party will not be heard unless that party has, not less than 2 days before the hearing, served on every other party written notice of that party's intention to attend the hearing and apply for, or oppose the making of, an order for costs.