Issue Estoppel in UK Law

That is to adopt too dogmatic an approach to what should in my opinion be a broad, merits-based judgment which takes account of the public and private interests involved and also takes account of all the facts of the case, focusing attention on the crucial question whether, in all the circumstances, a party is misusing or abusing the process of the court by seeking to raise before it the issue which could have been raised before.

Cause of action estoppel arises where the cause of action in the later proceedings is identical to that in the earlier proceedings, the latter having been between the same parties or their privies and having involved the same subject matter. In such a case the bar is absolute in relation to all points decided unless fraud or collusion is alleged, such as to justify setting aside the earlier judgment.

In my opinion your Lordships should affirm it to be the law that there may be an exception to issue estoppel in the special circumstance that there has become available to a party further material relevant to the correct determination of a point involved in the earlier proceedings, whether or not that point was specifically raised and decided, being material which could not by reasonable diligence have been adduced in those proceedings.

If in litigation upon one such cause of action any of such separate issues as to whether a particular condition has been fulfilled is determined by a Court of competent jurisdiction, either upon evidence or upon admission by a party to the litigation, neither party can, in subsequent litigation between one another upon any cause of action which depends upon the fulfilment of the identical condition, assert that the condition was fulfilled if the Court has in the first litigation determined that it was not, or deny that it was fulfilled if the Court in the first litigation determined that it was.

As my noble and learned friend, Lord Reid, has already pointed out there may be many reasons why a litigant in the earlier litigation has not pressed or may even for good reason have abandoned a particular issue. All estoppels are not odious but must be applied so as to work justice and not injustice and I think the principle of issue estoppel must be applied to the circumstances of the subsequent case with this overriding consideration in mind.

The first requirement is that the judgment in the earlier action relied on as creating an estoppel must be (a) of a court of competent jurisdiction, (b) final and conclusive and (c) on the merits. The third requirement is that the issue in the later action, in which the estoppel is raised as a bar, must be the same issue as that decided by the judgment in the earlier action.

The rule is not based on the doctrine of res judicata in a narrow sense, nor even on any strict doctrine of issue or cause of action estoppel. It is a rule of public policy based on the desirability, in the general interest as well as that of the parties themselves, that litigation should not drag on for ever and that a defendant should not be oppressed by successive suits when one would do.