Update 1 February 2021 Turner J last week refused permission to appeal (which can now still be taken to the Court of Appeal itself).
I am instructed for claimants in the case hence my post here is a succinct report, not a review and it must not be read as anything else.
Turner J yesterday struck out (not just: stayed) the case against the companies jointly operating the facilities that led to the 2015 Brazilian dam break and consequential human and environmental loss in Município De Mariana & Ors v BHP Group Plc & Anor  EWHC 2930 (TCC). I reported on the case before here.
Eyre J’s earlier Order had identified the threefold jurisdictional challenge: 1. Forum non conveniens for non-EU defendants; 2. Article 34 Brussels IA for the EU-based defendants; 3. Abuse of process, case management for both.
In his judgment Turner J makes abuse of process the core of the case, hinging his subsequent obiter analysis of forum non and of Article 34 on his views viz abuse. At the centre of his abuse analysis is his interpretation of AB v John Wyeth & Brother (No.4), also known as the benzodiazepine litigation, with the points he takes from that judgment (even after the subsequent CPR rules wre issued) summarized at 76.
At 80 ff is a discussion (see e.g. my earlier review of Donaldson DJ in Zavarco) on the use of case-management powers, including abuse, against EU-domiciled defendants post CJEU Owusu (the ‘back-door analogy per Lewison J in Skype technologies SA v Joltid Ltd  EWHC 2783 (Ch) ).
At 99 ff Turner J pays a lot of attention to the impact of accepting jurisdiction on the working of the courts in England, discusses some of the practicalities including language issues, and decides at 141 in an extract which has already caught the attention of others, that ‘In particular, the claimants’ tactical decision to progress closely related damages claims in the Brazilian and English jurisdictions simultaneously is an initiative the consequences of which, if unchecked, would foist upon the English courts the largest white elephant in the history of group actions.’
At 146 ff follow the obiter considerations of the remaining grounds, Article 34 Recast, forum non conveniens and case management stay. On Article 34 viz BHP Plc, the issue of ‘relatedness’ is discussed with reference of course to Euroeco and the tension between that case and Privatbank, as I flag ia here, holding at 199 in favour of Privatbank as the leading authority (hence focus on desirability of hearing cases together rather than on practical possibility). On relatedness, Turner J does not follow the approach of either Zavarco or Jalla, both of course first instance decisions.
At 206 Turner J takes the instructions of recital 24 Brussels Ia’s ‘all circumstances of the case’ to mean including circumstances which would ordinarily be part of a forum non consideration, despite Owusu, and at 231 Jalla is distinguished (at least practically; Jalla is not authority for the judge here) and i.a. at 221 Turner J lists his reasons for allowing an Article 34 stay (again: these are obiter views). As already noted, these echo his findings on abuse of process.
The forum non conveniens analysis viz BHP Ltd at 235 ff, applying Spiliada, delivers inter alia on an inherent implication of Lord Briggs’ suggestions in Vedanta: that a commitment of defendants voluntarily to submit to the foreign alternative jurisdiction, hands them the key to unlock forum non. At 241: ‘In this case, both defendants have offered to submit themselves to the jurisdiction of Brazil. Thus the force of any suggestion that there may be a risk of irreconcilable judgements against each defendant is attenuated.’
Conclusions, at 265:
(i) I strike out the claims against both defendants as an abuse of the process of the court;
(ii) If my finding of abuse were correct but my decision to strike out were wrong, then I would stay the claims leaving open the possibility of the claimants, or some of them, seeking to lift the stay in future but without pre-determining the timing of any such application or the circumstances in which such an application would be liable to succeed;
(iii) If my finding of abuse were wrong, then I would, in any event, stay the claim against BHP Plc by the application of Article 34 of the Recast Regulation;
(iv) If my finding of abuse were wrong, then I would, in any event, stay the claims against BHP Ltd on the grounds of forum non conveniens regardless of whether the BHP reliance on Article 34 of the Recast Regulation had been successful or not;
(v) If my findings on the abuse of process point were wrong, then a free-standing decision to impose a stay on case management grounds would probably be unsustainable.
Appeal is of course being considered.
(Handbook of) European Private International Law, 2nd ed. 2016, Chapter 8, Heading 8.3.
3rd ed. forthcoming February 2021.