Thank you Ben Zielinski for flagging Bank Leumi (UK) Plc v Screw Conveyor Ltd  CSOH 129. I believe Ben is right in writing that this is the first formal acknowledgement that Scottish judicial authorities have no insolvency business in respect of an English registered company, and the same applies to English courts and Scottish companies, in spite of the EU’s Insolvency Regulation.
Even if a company carries out its main activities in Scotland, internal UK jurisdictional rules will assign insolvency jurisdiction to the English judicial authorities. That is a result of, as Lord Doherty writes, the Insolvency Regulations designating the ‘Member State the courts of which may open insolvency proceedings’ however ‘territorial jurisdiction within that Member State is established by the Member State’s national law’ (at 9).
(Handbook of) EU private international law, 2nd ed. 2016, Chapter 5, Heading 5.6.1.