While Brexit may seem to have been "done" in January 2021, lawmakers have continued working on legislation that would effectively remove the principle of European Union law supremacy and general principles of EU law and directly effective EU rights. The upshot of this is that, as of Jan 1st, when the Retained EU Law (Revocation and Reform) Act 2023 entered into force, the U.K. is no longer required to interpret its laws in line with previously harmonized EU laws.
Michael Shaw and David Kemp's piece discussing the differences between U.K. and EU examination of trademark applications, and likely future divergence, has been posted to Law360, which can be read in full below.