“60. Thus, in Administrative Court cases, just as in other civil litigation, particularly where a claim has been settled, there is, in my view, a sharp difference between (i) a case where a claimant has been wholly successful whether following a contested hearing or pursuant to a settlement, and (ii) a case where he has only succeeded in part following a contested hearing, or pursuant to a settlement, and (iii) a case where there has been some compromise which does not actually reflect the claimant’s claims. While in every case, the allocation of costs will depend on the specific facts, there are some points which can be made about these different types of case. 61. In case (i), it is hard to see why the claimant should not recover all his costs, unless there is some good reason to the contrary. Whether pursuant to judgment following a contested hearing, or by virtue of a settlement, the claimant can, at least absent special circumstances, say that he has been vindicated, and, as the successful party, that he should recover his costs. In the latter case, the defendants can no doubt say that they were realistic in settling, and should not be penalised in costs, but the answer to that point is that the defendants should, on that basis, have settled before the proceedings were issued: that is one of the main points of the pre-action protocols.”
“In case (iii), the court is often unable to gauge whether there is a successful party in any respect, and, if so, who it is. In such cases, therefore, there is an even more powerful argument that the default position should be no order for costs. However, in some such cases, it may well be sensible to look at the underlying claims and inquire whether it was tolerably clear who would have won if the matter had not settled. If it is, then that may well strongly support the contention that the party who would have won did better out of the settlement, and therefore did win.”
“The decision in M represents an acceptance that there will be cases where the link between the claim and the agreed relief is so clear that the claimant can properly be treated as the successful party for the purpose of an award of costs. But for that link to be established the court is, I think, usually required to be satisfied that the claimant is likely to have won: see Lord Neuberger at [51] of M. In any event, the claim must be causative of the relief obtained.”