Update 2 October 2018 the Court of Appeal on 26 September 2018 in  EWHC 2499 (Comm) had to hold again on allowing a re-amended claim in the case.
In  EWCA Civ 1581 Tatneft v Bogolyubov the Court of Appeal held that an English court can allow addition of a claim which is time barred by the governing law identified by Rome I or Rome II. At 72 Longmore J notes ‘Under Article 12.1(d) of Rome I and Article 15(h) of Rome II, the applicable foreign law governs limitation of actions.’ However neither Rome I nor Rome II apply to matters of procedure (Article 1(3) in both of the Rome Regulations).
The Court of Appeal clearly takes Article 1(3) at face value by allowing amendment of the claim even if it thence includes a claim time barred under the lex causae: not to do so would endanger the consistent application of English procedural law. Article 12 cq 15 do not sit easily with Article 1(3). That has been clear from the start and it is an issue which needs sorting out. In the absence of such clarification, it is no surprise that the English courts should hold as Longmore J does here.
(Handbook of) EU Private international law, 2nd ed. 2016, Chapter 3, Chapter 4.