“… for the future, if a similar issue arises in complex commercial multi-party litigation, it must be referred to the court seized of the proceedings. It is plainly not only in the interest of the parties, but also in the public interest and in the interest of the efficient use of court resources that this is done. There can be no excuse for failure to do so in the future.”
“The[re] is [an] underlying public interest … that there should be finality in litigation and that a party should not be twice vexed in the same matter. This public interest is reinforced by the current emphasis on efficiency and economy in the conduct of litigation, in the interests of the parties and the public as a whole. The bringing of a claim or the raising of a defence in later proceedings may, without more, amount to abuse if the court is satisfied (the onus being on the party alleging abuse) that the claim or defence should have been raised in the earlier proceedings if it was to be raised at all. I would not accept that it is necessary, before abuse may be found, to identify any additional element such as a collateral attack on a previous decision or some dishonesty, but where those elements are present the later proceedings will be much more obviously abusive, and there will rarely be a finding of abuse unless the later proceeding involves what the court regards as unjust harassment of a party. It is, however, wrong to hold that because a matter could have been raised in earlier proceedings it should have been, so as to render the raising of it in later proceedings necessarily abusive. 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. As one cannot comprehensively list all possible forms of abuse, so one cannot formulate any hard and fast rule to determine whether, on given facts, abuse is to be found or not. … [I]t is in my view preferable to ask whether in all the circumstances a party's conduct is an abuse than to ask whether the conduct is an abuse and then, if it is, to ask whether the abuse is excused or justified by special circumstances. Properly applied, and whatever the legitimacy of its descent, the rule has in my view a valuable part to play in protecting the interests of justice.”
“49. … (i) Where A has brought an action against B, a later action against B or C may be struck out where the second action is an abuse of process. (ii) A later action against B is much more likely to be held to be an abuse of process than a later action against C. (iii) The burden of establishing abuse of process is on B or C or as the case may be. (iv) It is wrong to hold that because a matter could have been raised in earlier proceedings it should have been, so as to render the raising of it in later proceedings necessarily abusive. (v) The question in every case is whether, applying a broad merits based approach, A's conduct is in all the circumstances an abuse of process. (vi) The court will rarely find that the later action is an abuse of process unless the later action involves unjust harassment or oppression of B or C. 50. Proposition (ii) above seems to me to be of importance because it is one thing to say that A should bring all his claims against B in one action, whereas it is quite another thing to say that he should bring all his claims against B and C (let alone against B, C, D, E, F and G) in one action. There may be many entirely legitimate reasons for a claimant deciding to bring an action against B first and, only later (and if necessary) against others. 51. Those reasons include, for example, the cost of proceeding against more than one defendant, especially where B is apparently solvent and the case against B seems stronger than against others. More defendants mean more lawyers, more time and more expense. This is especially so in large commercial disputes. It by no means follows that either the public interest in efficiency and economy in litigation or the interests of the parties, including in particular the interests of C, D and E, is or are best served by one action against them all. 52. It seems to me that the courts should be astute to ensure that it is only in a case where C can establish oppression or an abuse of process that a later action against C should be struck out. I could not help wondering whether the defendants in this case would have given their lawyers the same instructions on the question whether they should have been sued in the first action if they had been asked before that action began as they have given now that a later action has been begun. 53. It is clear from the speeches of both Lord Bingham and Lord Millett that all depends upon the circumstances of the particular case and that the court should adopt a broad merits based approach, but it is likely that the most important question in any case will be whether C, D, E or any other new defendant in a later action can persuade the court that the action against him is oppressive. It seems to me to be likely to be a rare case in which he will succeed in doing so.”
“… However desirable it may be for a party to bring all his claims forward in one go, the abuse principle, as the judgments in the Stuart case … underline, does not bar a claim simply because someone fails to raise a claim when he could have done so. The facts must be such that the second action amounts to an abuse of process before it can be struck out. The importance of the general principle that every person with an arguable claim should be able to pursue it in court is enshrined inarticle 6 of the Convention for the Protection of Human rights and Fundamental Freedoms. As Sir Anthony Clarke MR indicated in the Stuart case, at para 98, if the court is not satisfied that a claimant’s attempt to raise his claim is actually abusive in the light of his previous failure to raise it, the claim cannot be barred from proceeding however desirable it might have been for the claimant to have raised it earlier.”
“It is … a remarkable feature of this case that [the Claimants] seek[] to make Threadneedle liable for the whole of its unrecovered losses because Threadneedle’s employee participated in the first stage of a two stage fraud in which the primary participants were five [Claimants’ group] employees and where the unconsummated second stage would have resulted in Threadneedle’s becoming (at least) a significant victim of the fraud.”