“70. There may be special cases where refusal to accept reasonable offers of settlement is capable of justifying an award of indemnity costs: see Epsom College v Pierse Contracting Southern Ltd[2011] EWCA Civ 1449 . But, as Rix LJ there emphasised, the failure to accept such offers, or to accede to an approach for settlement, must be unreasonable: - see paragraphs 71 and 72 of his judgment. He referred to the judgment of Simon Brown LJ in the Kiam case. In the course of his judgment (with which Waller LJ and Sedley LJ agreed), Simon Brown LJ had said this: "12. I for my part, understand the Court there to have been deciding no more than that conduct, albeit falling short of misconduct deserving of moral condemnation, can be so unreasonable as to justify an order for indemnity costs. With that I respectfully agree. To my mind, however, such conduct would need to be unreasonable to a high degree; unreasonable in this context certainly does not mean merely wrong or misguided in hindsight. An indemnity costs order made under Rule 44 (unlike one made under Rule 36) does, I think, carry at least some stigma. It is of its nature penal rather than exhortatory. The indemnity costs order made on the principal appeal in McPhilemy was certainly of that character. We held that the appeal involved an abuse of process on the footing that: "to have permitted the defendants to argue their case on perversity must inevitably have bought the administration of justice into disrepute among right-thinking people." 13. It follows from all this that in my judgment it will be a rare case indeed where the refusal of a settlement offer will attract under Rule 44 not merely an adverse order for costs, but an order on an indemnity rather than standard basis. …. It is very important that Reid Minty should not be understood and applied for all the world as if under the CPR it is now generally appropriate to condemn in indemnity costs those who decline reasonable settlement offers. Those observations are, as it seems to me, directly in point in the present case.” "to have permitted the defendants to argue their case on perversity must inevitably have bought the administration of justice into disrepute among right-thinking people." Those observations are, as it seems to me, directly in point in the present case.”
“(8) Where the court orders a party to pay costs subject to detailed assessment, it will order that party to pay a reasonable sum on account of costs, unless there is good reason not to do so.”
“The principles to be applied are to be found in Excalibur Ventures LLC v Texas Keystone Inc[2015] EWHC 566 (Comm) , per Christopher Clarke LJ at [23]-[28]. The task of the court is to identify a reasonable sum, having regard to all the circumstances, including the difficulty if any that may be faced in recovering the costs, the means of the parties, the imminence of any assessment and whether the paying party would have any difficulty in recovery in case of any overpayment. A reasonable sum will often be one that was an estimate of the likely level of recovery subject to an appropriate margin to allow for error in the estimation. It is appropriate to award an amount which is "not too much below" the likely level of recovery.”
“23. What is a reasonable amount will depend 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. Any sum will have to be an estimate. 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. 24. 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.”