MiFID II regulates the provision of investment services and activities, and related market infrastructure. The EU MiFID II regime was onshored in the UK post-Brexit, with some adjustments to make the regime operate properly from a UK-only perspective.
However, the UK authorities have already made various further changes to the UK regime as part of the Wholesale Markets Review, and are reviewing other aspects. Ultimately there may be significant divergence between the EU and UK regimes..
MiFID II Update 2021