Kazakhstan Kagazy PLC v Zhunus  EWHC 404 (Comm)
Mr Justice Leggatt gave guidance on the approach to proportionality which should be taken in hard fought litigation, with neither side showing any sense of moderation, and where the sums in issue exceeded many millions of pounds.
“ In a case such as this where very large amounts of money are at stake, it may be entirely reasonable from the point of view of a party incurring costs to spare no expense that might possibly help to influence the result of the proceedings. It does not follow, however, that such expense should be regarded as reasonably or proportionately incurred or reasonable and proportionate in amount when it comes to determining what costs are recoverable from the other party. What is reasonable and proportionate in that context must be judged objectively. The touchstone is not the amount of costs which it was in a party’s best interests to incur but the lowest amount which it could reasonably have been expected to spend in order to have its case conducted and presented proficiently, having regard to all the relevant circumstances. Expenditure over and above this level should be for a party’s own account and not recoverable from the other party. This approach is first of all fair. It is fair to distinguish between, on the one hand, costs which are reasonably attributable to the other party’s conduct in bringing or contesting the proceeding or otherwise causing costs to be incurred and, on the other hand, costs which are attributable to a party’s own choice about how best to advance its interests. There are also good policy reasons for drawing this distinction, which include discouraging waste and seeking to deter the escalation of costs for the overall benefit for litigants.”