Jurisdiction(s):
United Kingdom

Related legal acts

Key definition

Brexit definition

What does Brexit mean? Brexit is the practical shorthand in legal drafting and advice for the United Kingdom’s withdrawal from the European Union and the legal, regulatory and trading changes flowing from it. It covers the UK’s cessation of EU membership on exit day (31 January 2020) and the cessation of the EEA Agreement’s application, the end of the implementation/transition period on IP completion day (31 December 2020), and the commencement, expiry or variation of post‑withdrawal trading and regulatory arrangements, including the UK‑EU Trade and Cooperation Agreement, the Windsor Framework (amending the Northern Ireland Protocol), and UK agreements with third countries...

UK–EU withdrawal timeline (2015–2020): Article 50 procedure, legislation, case law, parliamentary and institutional milestones (archived)

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Practice notes

ARCHIVED : This Practice Note has been archived and is not maintained.

On 23 June 2016, the UK held a referendum on EU membership, with a majority backing departure from the EU (also known as ‘brexit’). On 29 March 2017, the Prime Minister gave formal notice of the UK’s intention to withdraw under Article 50 TEU, initiating the exit process—see: Brexit: UK Article 50 TEU notification starts the clock—what happens now?

This Practice Note traces the sequence of key events and updates, presented in reverse chronological order: from the referendum through to the triggering of Article 50 TEU, and from that point to the UK’s formal withdrawal from the EU on 31 January 2020. Developments after that date appear in our Brexit timeline. For broader context, see our Brexit subtopic—Brexit—overview. For updates and guidance tailored to particular practice areas, see: Brexit collection.

Brexit timeline—2020 (up to exit day)

31 January 2020 (11 pm) — EU/UK — Exit day: the UK formally ended its EU membership at 11 pm on 31 January 2020 (exit day)...

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Web page updated on 22/05/2026

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