A note on the operation of UK law following the end of the post-Brexit transition period, focusing on retained EU law and assimilated law. The note also gives an overview of other Brexit-related legal changes, including the implementation into UK law of the UK-EU withdrawal agreement and the UK-EU trade and co-operation agreement, and the post-transition status of EU case law.

For practical guides on the application of these legal rules, see Practice note, Guide to assessing legal change after end of post-Brexit transition period and Retained EU law and assimilated law FAQs.