" 26. Costs (1) For the purposes of these rules "costs" means- (a) if the proceedings are taking place before a tribunal in England and Wales, costs and expenses recoverable in proceedings before the Supreme Court of England and Wales; (b) if the proceedings are taking place before a tribunal in Scotland, costs and expenses recoverable in proceedings before the Court of Session; and (c) if the proceedings are taking place before a tribunal in Northern Ireland, costs and expenses recoverable in proceedings before the Supreme Court of Northern Ireland. (2) The tribunal may at its discretion, 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 or Chairman 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."