Update 01 March 2023 the Court of Appeal has today confirmed Cockerill J’s approach in a succinct judgment: Kwok & Ors v UBS AG (London Branch)  EWCA Civ 222
Update 25 02 2022 thank you Matthew Hoyle for letting me know that Justice Cockerill today granted UBS permission to appeal against her judgment.
In Kwok & Ors v UBS AG (London Branch)  EWHC 245 (Comm) Cockerill J holds on forum damni (Article 5(3) for purely economic loss, and branch jurisdiction (Article 5(5) for the English courts under the Lugano Convention. Defendant is Switserland based and the proceedings clearly were initiated prior to Brexit.
On A5(3) locus damni, all parties and the judge agree that CJEU authority is not easy to disentangle and does not unequivocally point into one direction: see eg  ‘the authorities are not entirely pellucid on what they do say.’
The bank, defending, argues ia that a rule of thumb under (limited) English authority is that in a case of negligent misstatement the damage will occur where the misstatement is received and relied upon. Cockerill J distinguishes the authority from current case and also points out  that all cases concerned predate the CJEU authority particularly in Lober and Vereniging van Effectenbezitters, and that ‘the tide of authority is against the proposition that loss is suffered wherever a claimant ultimately feels it’ . Having summarised the lines of interpretation following from CJEU authority, she concludes 
Once the focus is on actual manifestation (of damage, GAVC) the most natural analysis is to view the damage as occurring where and when the Acquired Shares were liquidated.
here, London, where the shares claimants had invested in were held and where the funds they had invested were depleted; the loss crystallises, manifests, becomes certain and irreversible with the sale of shares and that loss of claimants’ Monetary Contribution which had merged into the shares .
The account, where the damage was first “registered” or “recorded” was in London with the defendant itself (as in CJEU Kronhofer) . The Universal Music-instructed ‘special circumstances’ cross-check also points to London: 
London was the place at which it had been agreed by all parties that the Acquired Shares would be held, and all of the contractual documents UBS entered into (albeit for a transaction at one remove from the Claimants) were to be in English and governed by English law. It was therefore entirely predictable and foreseeable from November 2014 that the parties might sue or be sued in London in relation to the Investment and dealings with the Acquired Shares.
Branch jurisdiction under Article 5(5) is dealt with obiter  ff. Cockerill J holds  that was is needed inter alia per CJEU flyLAL is ‘sufficient nexus’, sufficiently significant connection does not require involvement in the tortious acts . This is supported, Cockerill J holds  by the fact that UBS London’s thoughts and actions will be relevant to the trial. There will be a need to investigate UBS London’s conduct and intentions both (i) at the time of the representations and advice given by UBS and (ii) late events and the loss resulting therefrom.
A good judgment to assist with the economic loss jigsaw.