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Yet again in Arnold v. National Westminster Bank Plc., [1991] 3 ALL ER 41, the House of Lords noticed the distinction between cause of action estoppel and issue estoppel. 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. The discovery of new factual matter which could not have been found out by reasonable diligence for use in the earlier proceedings does not, according to the law of England, permit the latter to be reopened. Issue estoppel may arise where a particular issue forming a necessary ingredient in a cause of action has been litigated and decided and in subsequent proceedings between the same parties involving a different cause of action to which the same issue is relevant, one of the parties seeks to reopen that issue. Here also bar is complete to relitigation but its operation can be thwarted under certain circumstances. The House then finally observed: but there is room for the view that the underlying principles upon which estoppel is based, public policy and justice have greater force in cause of action estoppel, the subject-matter of the two proceedings being identical, than they do in issue estoppel, where the subject-matter is different. Once it is accepted that different considerations apply to issue estoppel, it is hard to perceive any logical distinction between a point which was previously raised and decided and one which might have been but was not. Given that the further material which would have put an entirely different complexion on the point was at the earlier stage unknown to the party and could not by reasonable diligence have been discovered by him, it is hard to see why there should be a different result according to whether he decided not to take the point, thinking it hopeless, or argue it faintly without any real hope of success.