A guide to assessing the extent and implications of legal change after the end of the post-Brexit transition period, covering general issues relevant to a range of UK legal practice areas and sectors. The note looks at the UK-EU withdrawal agreement, retained EU law, assimilated law, UK policy change, future UK-EU relationship agreements, unilateral measures, and the UK's international agreements with non-EU countries. It lays the groundwork common to many Brexit-related queries, includes worked examples and frequently asked questions, and explains how to locate and identify relevant information.