United Kingdom–European Union relations
The United Kingdom is not currently a member state of the European Union, however it was from 1973 to 2020. Relations between the European Union (EU) and the United Kingdom of Great Britain and Northern Ireland (UK) are governed, since 1 January 2021, by the EU–UK Trade and Cooperation Agreement (TCA).
Source: Wikipedia — United Kingdom–European Union relations (CC BY-SA 4.0)