“(1) The court has discretion as to – (a) whether costs are payable by one party to another; (b) the amount of those costs; and (c) when they are to be paid. (2) If the court decides to make an order about costs – (a) the general rule is that the unsuccessful party will be ordered to pay the costs of the successful party; but (b) the court may make a different order. … (4) In deciding what order (if any) to make about costs, the court must have regard to all the circumstances, including – (a) the conduct of all the parties; (b) whether a party has succeeded on part of his case, even if he has not been wholly successful; … (5) The conduct of the parties includes – (a) conduct before, as well as during, the proceedings and in particular the extent to which the parties followed the Practice Direction (Pre-Action Conduct) or any relevant pre-action protocol; (b) whether it was reasonable for a party to raise, pursue or contest a particular allegation or issue; (c) the manner in which a party has pursued or defended his case or a particular allegation or issue; and (d) whether a claimant who has succeeded in his claim, in whole or in part, exaggerated his claim. (6) The orders which the court may make under this rule include an order that a party must pay – (a) a proportion of another party’s costs; (b) a stated amount in respect of another party’s costs; (c) costs from or until a certain date only; … (e) costs relating to particular steps taken in the proceedings; (f) costs relating only to a distinct part of the proceedings; and (g) interest on costs from or until a certain date, including a date before judgment.