“Where the amount of costs is to be assessed on the standard basis, the court will (a) only allow costs which are proportionate to the matters in issue; and (b) resolve any doubt which it may have as to whether costs were reasonably incurred or reasonable and proportionate in amount in favour of the paying party.”
“Necessarily, the determination of a reasonable sum involves the court in arriving at some estimation of the costs that the receiving party is likely to be awarded by the costs judge in the detailed assessment proceedings or as a result of a compromise of those proceedings. In a case of any complexity, the evidence and submissions arguably relevant to that exercise may be extensive. The court has to guard against the risk that it may be drawn into costly and time-consuming satellite litigation. There is no rule that the amount ordered to be paid on account should be the irreducible minimum of what may be awarded on detailed assessment (Gollop v Pryke, November 29, 2011, unrep. (Warren J.)). The relevant authorities were reviewed by Christopher Clarke L.J. in Excalibur Ventures LLC v Texas Keystone Inc[2015] EWHC 566 (Comm) , February 3, 2015, unrep., where he concluded that what is a reasonable sum on account of costs will have to be an estimate dependent on the circumstances, the chief of which is that there will, by definition, have been no detailed assessment and thus an element of uncertainty, the extent of which may differ widely from case to case as to what will be allowed on detailed assessment. He explained (paras 23 and 24) that a reasonable sum would often be one that was an estimate of the likely level of recovery subject, as the costs claimants accept, to an appropriate margin to allow for error in the estimation. This can be done by taking the lowest figure in a likely range or making a deduction from a single estimated figure or perhaps from the lowest figure in the range if the range itself is not very broad. In determining whether to order any payment and its amount, account needs to be taken of all relevant factors including the likelihood (if it can be assessed) of the claimants being awarded the costs that they seek or a lesser and if so what proportion of them; the difficulty, if any, that may be faced in recovering those costs; the likelihood of a successful appeal; the means of the parties; the imminence of any assessment; any relevant delay and whether the paying party will have any difficulty in recovery in the case of any overpayment.”