I posted the Tweet below in October, and am posting mostly to report that I do not as yet have more to go by. The suit is against James Finlay and follows in the footsteps of one brought in 2017, pre-Brexit therefore. The 2017 action per CJEU Owusu v Jackson cannot be subject to a forum non conveniens challenge, and I am as yet not aware of an Article 33-34 Brussels IA ‘forum non light’ defence. This new, 2021 action has already been said to be met with a forum non challenge. It will be interesting to see first of all whether the forum non challenge in the latest suit will be impacted by the unavailability in principle of forum non in the 2017 suit; additionally, whether defendants are aiming to have the 2017 suit thrown out on the basis of A33-34 BIa (so far I have not seen indications that they will).
As I point out in the Tweet, had the UK been allowed to join Lugano, forum non would not be available to this newest suit.
EU Private International Law, 3rd ed. 2021, Chapter 7.