25.—F1(1) Provision may be made by rules as to the persons who are to be made respondents on an application for the variation or revocation of an order under Article[F2 22]; and if on an application under[F2 that Article] there are two or more respondents, the powers of the court under[F3 Article 163 of the Magistrates' Courts (Northern Ireland) Order 1981] shall be deemed to include power, whatever adjudication the court makes on the application, to order any of the parties to pay the whole or part of the costs of all or any of the other parties.
(2) The powers of a court of summary jurisdiction under[F3 Article 86 of the said Order of 1981] to revoke, suspend, revive, vary or discharge an order for the periodical payment of money[F4 and the power of the clerk of petty sessions to vary such an order] shall not apply in relation to an order made under this Order.