Update 13 September 2019 same principles on jurisdiction (and reference to NN2Newco) made by Falk J in  EWHC 2412 (Ch) Syncreon Group BV.
Update 20 August 2019 For an Irish approval of a scheme of arrangement with extensive US links see Re Ballantyne RE Plc & the Companies Act 2014  IEHC 407, reported here.
The Nyrstar business was created on 31 August 2007 by combining the zinc and lead
smelting and alloying operations of Zinifex Limited and Umicore NV/SA. Nyrstar is a global multi-metals business, with a market leading position in zinc and lead, and growing positions in other base and precious metals. It is one of the world’s largest zinc smelting companies based on production levels. The Nyrstar business has mining, smelting and other operations located in Europe, the Americas and Australia and employs approximately 4,200 people. The ultimate group Parent is incorporated in Belgium and has corporate offices in Zurich, Switzerland.
Its debt is now being restructured using an English scheme of arrangement, with a variety of new companies being formed as corporate vehicles for same. Readers of the blog will not be surprised: this is a classic example of regulatory (restructuring) competition, which I regularly report on the blog (most recently: New Look, with further references there).
In  EWHC 1917 (Ch) re NN2 Newco limited and Politus BV, Norris J applies the now estblished jurisdictional test, with one or two points of attention. Against the scheme company jurisdiction is straightforward: this is England incorporated. Against the scheme creditors, English courts apply the jurisdictional test viz the Brussels Ia Regulation arguendo: if it were to apply (which the English Courts have taken no definitive stance on), would an English court have jurisdiction?
At 11: viz the Notes:
They are now governed by English law (in place of New York law). Clause 12.06 of the governing Indenture now reads:- “The courts of England and Wales shall have jurisdiction to settle any disputes that arise out of or in connection with the Indenture, the Notes and the Guarantees, and accordingly any legal action or proceedings arising out of or in connection with the Indenture the Notes and the Guarantees (“Proceedings”) may be brought in such courts. The courts of England and Wales shall have exclusive jurisdiction to settle any Proceedings instituted by [NNH or NN2]… in relation to any Holder or the Trustee on behalf of the Holders (“Issuer Proceedings”). [NNH and NN2], each of the Guarantors, the Trustee and each Holder (each, “a Party”) irrevocably submit to the jurisdiction of such courts and agree that the courts of England and Wales are the most appropriate and the most convenient courts to settle Issuer Proceedings and accordingly no party shall argue to the contrary. Notwithstanding the foregoing, this section 12.06 shall not limit the rights of… each of the Holders to institute any Proceedings against [NNH and NN2] in any other court of competent jurisdiction, nor shall the taking of Proceedings in one or more jurisdictions preclude the taking of proceedings in any other jurisdiction….”
This is an asymmetric jurisdiction clause. The English Courts have jurisdiction over all disputes and the parties agree that they are the most convenient forum and submit to the jurisdiction of the English courts. NNH and NN2 are bound to use the English courts if they sue the Holder of a Note, because the English courts have exclusive jurisdiction in such a case. But the Holder of a Note can also sue NNH and NN2 in any Court that otherwise has jurisdiction, so the English courts have a non-exclusive jurisdiction in such a case.
The original governing law of the Existing Bonds was English law. But the holders voted to amend the jurisdiction clause in the Trust Deed to provide: “The courts of England and Wales shall have exclusive jurisdiction to settle any disputes that arise out of or in connection with the Trust Deed and the Bonds, and accordingly any legal action or proceedings arising out of or in connection with the Trust Deed and the Bonds (“Proceedings”) may be brought in such courts. [NNV and NN2] and the Trustee (in its own capacity as such and on behalf of the Bondholders) irrevocably submit to the jurisdiction of such courts and waive any objection to Proceedings in such courts whether on the ground of venue or on the ground that the Proceedings have been brought in an inconvenient forum. Notwithstanding the foregoing, Belgian courts have exclusive jurisdiction over matters concerning the validity of decisions of the Board of Directors of NNV of the general meeting of shareholders of NNV and of the general meeting of Bondholders.”
This is a symmetrical jurisdiction clause with a “carve out” for specific proceedings.”
At 18 ff the details of the scheme are outlined. It involves Trafigura financial instruments, Trafigura now being Nyrstar’s controlling shareholder. At 31 ff jurisdiction is discussed. There is no abusive forum shopping (per Codere; which I reference here). The usual Article 8 and Article 25 routes are discussed. With respect to Article 25, the English jurisdiction clauses in the Existing Notes and the Politus Facility are asymmetric; however Norris J at 41 (with reference to authority) does not see that as an obstacle seeing as Article 25 covers both symmetric and asymmetric choice of court.
A final hurdle is whether any order sanctioning the scheme is likely to be effective or whether it is apparent even at this stage that the scheme will not be recognised in other relevant jurisdictions even if sanctioned: this will eventually be settled at the sanctioning hearing however Norris J already indicates that it is unlikely that expert evidence will yield surprising (objectionable) results.
Scheme meetings may therefore be convened.
(Handbook of) EU Private International Law, 2nd edition 2016, Chapter 2, Chapter 5.