"(1) For the purposes of these rules "costs" means costs and expenses recoverable in proceedings before the Supreme Court of England and Wales, the Court of Session, or the Supreme Court of Northern Ireland (2) The Tribunal may at its discretion, subject to paragraph (3), at any stage of the proceedings, make any order it thinks fit in relation to the payment of costs by one party to another in respect of the whole or part of the proceedings and, in determining how much the party is required to pay, the Tribunal may take account of the conduct of all parties in relation to the proceedings. (3) Any party against whom an order for costs is made shall, if the Tribunal so directs, pay to any other party a lump sum by way of costs, or such proportion of the costs as may be just. The Tribunal may assess the sum to be paid pursuant to any order made under paragraph (2) above or may direct that it be assessed by the President, a chairman or the Registrar or dealt with by the detailed assessment of the costs by a costs officer of the Supreme Court or a taxing officer of the Supreme Court of Northern Ireland or by the Auditor of the Court of Session. …"
"Unless the context otherwise requires- (a) Parts I and V of these rules apply to all proceedings before the Tribunal …"
"(3) The Tribunal may give its permission for a claim to be made before the end of the [relevant] period … after taking into account any observations of a proposed defendant ."
"(1) Subject to the provisions of this or any other enactment and to rules of court, the costs of and incidental to all proceedings in…the High Court…shall be in the discretion of the court. (2)…. (3) The court shall have full power to determine by whom and to what extent the costs are to be paid."