“Normally a party cannot raise in subsequent proceedings claims or issues which could and should have been raised in the first proceedings. … The justice of this as a general principle is, in my view, obvious. It is not merely a matter of efficiency, expediency and cost, but of substantial justice. Parties to litigation are entitled to know where they stand. The parties are entitled, and the court requires, to know what the issues are. Upon this depends a variety of decisions, including, by the parties, what evidence to call, how much effort and money it is appropriate to invest in the case, and generally how to conduct the case; and, by the court, what case management and administrative decisions and directions to make and give, and the substantive decisions in the case itself. Litigation should be resolved once and for all, and it is not, generally speaking, just if a party who successfully contested a case advanced on one basis should be expected to face on appeal, not a challenge to the original decision, but a new case advanced on a different basis. There may be exceptional cases in which the court would not apply the general principle which I have expressed. But in my view, this is not such a case.” … 73. Moreover, the mere fact that permission to appeal on this issue has been granted does not mean that it is necessarily appropriate for us to hear argument on the point. In Mullarkey v Broad[2009] EWCA Civ 2 permission to appeal had been granted ahead of the substantive hearing, but the question nevertheless arose at the subsequent hearing of whether the appellant should be allowed to present its case on appeal on new points that had not been raised in the case below under appeal. Lloyd LJ explained: “29. Points of this kind more often arise at the stage of an application for permission to appeal or, if permission has been granted, on seeking to amend the grounds of appeal. Here, by contrast, permission to appeal has been given on grounds which include the new points. However, the grant of permission, on which the Respondent was not heard, only shows that there were thought to be reasonable prospects of success. It does not amount to a grant of leave, binding on both parties, to rely on the new point. All it means is that the Appellant was given the right to argue in favour of this at a full hearing ... 30. The authority cited by Counsel in relation to the question whether a concession should be allowed to be withdrawn is Pittalis v Grant[1989] 1 QB 605 , in particular a passage in the judgment of Nourse LJ at page 611, as follows: ‘The stance which an appellate court should take towards a point not raised at the trial is in general well settled … It is perhaps best stated in Ex parte Firth, In re Cowburn (1882) 19 ChD 419, 429, per Sir George Jessel M.R.: ‘the rule is that, if a point was not taken before the tribunal which hears the evidence, and evidence could have been adduced which by any possibility would prevent the point from succeeding, it cannot be taken afterwards. You are bound to take the point in the first instance, so as to enable the other party to give evidence.’ Even if the point is a pure point of law, the appellate court retains a discretion to exclude it. But where we can be confident, first, that the other party has had opportunity enough to meet it, secondly, that he has not acted to his detriment on the faith of the earlier omission to raise it and, thirdly, that he can be adequately protected in costs, our usual practice is to allow a pure point of law not raised below to be taken in this court. Otherwise, in the name of doing justice to the other party, we might, through visiting the sins of the adviser on the client, do an injustice to the party who seeks to raise it.’ ” ‘The stance which an appellate court should take towards a point not raised at the trial is in general well settled … It is perhaps best stated in Ex parte Firth, In re Cowburn (1882) 19 ChD 419, 429, per Sir George Jessel M.R.: ‘the rule is that, if a point was not taken before the tribunal which hears the evidence, and evidence could have been adduced which by any possibility would prevent the point from succeeding, it cannot be taken afterwards. You are bound to take the point in the first instance, so as to enable the other party to give evidence.’ Even if the point is a pure point of law, the appellate court retains a discretion to exclude it. But where we can be confident, first, that the other party has had opportunity enough to meet it, secondly, that he has not acted to his detriment on the faith of the earlier omission to raise it and, thirdly, that he can be adequately protected in costs, our usual practice is to allow a pure point of law not raised below to be taken in this court. Otherwise, in the name of doing justice to the other party, we might, through visiting the sins of the adviser on the client, do an injustice to the party who seeks to raise it.’ ”