Withdrawal from the European Union is the legal and political process whereby an EU member state ceases to be a member of the Union. Article 50 of the Treaty on European Union (TEU) states that "Any Member State may decide to withdraw from the Union in accordance with its own constitutional requirements".
The United Kingdom European Union membership referendum, commonly referred to as the EU referendum or the Brexit referendum, took place on 23 June 2016 in the United Kingdom (UK) and Gibraltar to ask the electorate whether the country should remain a member of, or leave, the European Union (EU). It was organised and facilitated through the European Union Referendum Act 2015 and the Political Parties, Elections and Referendums Act 2000. The referendum resulted in 51.9% of the votes cast being in favour of leaving the EU. Although the referendum was legally non-binding, the government of the time promised to implement the result.
Brexit was the withdrawal of the United Kingdom (UK) from the European Union (EU) at 23:00 GMT on 31 January 2020. The UK is the only sovereign country to have left the EU. The UK had been a member state of the union and its predecessor the European Communities (EC) since 1 January 1973. Following Brexit, EU law and the Court of Justice of the European Union no longer have primacy over British laws, except in select areas in relation to Northern Ireland. The European Union (Withdrawal) Act 2018 retains relevant EU law as domestic law, which the UK can now amend or repeal. Under the terms of the Brexit withdrawal agreement, Northern Ireland continues to participate in the European Single Market in relation to goods, and to be a de facto member of the EU Customs Union.
The European Union Referendum Act 2015 is an Act of the Parliament of the United Kingdom that made legal provision for a consultative referendum to be held in the United Kingdom and Gibraltar, on whether it should remain a member state of the European Union or leave the bloc altogether. The Bill was introduced to the House of Commons by Philip Hammond, Foreign Secretary on 28 May 2015. Two weeks later, the second reading of the Bill was supported by MPs from all parties except the SNP; the Bill subsequently passed on its third reading in the Commons on 7 September 2015. It was approved by the House of Lords on 14 December 2015, and given Royal Assent on 17 December 2015. The Act came partly into force on the same day and came into full legal force on 1 February 2016.
The European Union (Referendum) Act 2016 is an Act of the Gibraltar Parliament, which implements the United Kingdom's European Union Referendum Act 2015 in Gibraltar. It was the first time a referendum has been held in Gibraltar on the issue of continued EU membership since the territory joined along with the United Kingdom in 1973 and was the first time that any British Overseas Territory had participated in a UK-wide referendum. The Act commenced on 26 January 2016, and received assent from the Governor of Gibraltar on 28 January 2016.
After the British EU membership referendum held on 23 June 2016, in which a majority voted to leave the European Union, the United Kingdom experienced political and economic upsets, with spillover effects across the rest of the European Union and the wider world. Prime Minister David Cameron, who had campaigned for Remain, announced his resignation on 24 June, triggering a Conservative leadership election, won by Home Secretary Theresa May. Following Leader of the Opposition Jeremy Corbyn's loss of a motion of no confidence among the Parliamentary Labour Party, he also faced a leadership challenge, which he won. Nigel Farage stepped down from leadership of the pro-Leave party UKIP in July. After the elected party leader resigned, Farage then became the party's interim leader on 5 October until Paul Nuttall was elected leader on 28 November.
The European Union (Referendum) Bill 2013–14 was a private member's bill of the Parliament of the United Kingdom designed to make provision for a referendum on membership of the European Union to be held in 2017 following renegotiation of terms between the European Union and the United Kingdom government. The bill ceased to be considered by Parliament after January 2014 and did not become law. However, a subsequent bill with the same objective, the European Union Referendum Act 2015, was later introduced to the House of Commons by the newly elected Conservative government in May 2015 was passed and received royal assent on 17 December 2015.
On 29 March 2017, the United Kingdom (UK) invoked Article 50 of the Treaty on European Union (TEU) which began the member state's withdrawal, commonly known as Brexit, from the European Union (EU). In compliance with the TEU, the UK gave formal notice to the European Council of its intention to withdraw from the EU to allow withdrawal negotiations to begin.
The European Union (Withdrawal) Act 2018 is an Act of the Parliament of the United Kingdom that provides both for repeal of the European Communities Act 1972, and for parliamentary approval to be required for any withdrawal agreement negotiated between the Government of the United Kingdom and the European Union. The bill's passage through both Houses of Parliament was completed on 20 June 2018 and it became law by Royal Assent on 26 June.
The European Union Act 2017 is an Act of the Parliament of the United Kingdom to empower the Prime Minister to give to the Council of the European Union the formal notice – required by Article 50 of the Treaty on European Union – for starting negotiations for the United Kingdom's withdrawal from the European Union. It was passed following the result of the 2016 United Kingdom European Union membership referendum held on 23 June in which 51.9% of voters voted to leave the European Union.
Between 2017 and 2019, representatives of the United Kingdom and the European Union negotiated the terms for Brexit, the planned withdrawal of the UK from the EU. These negotiations arose following the decision of the Parliament of the United Kingdom to invoke Article 50 of the Treaty on European Union, following the UK's EU membership referendum on 23 June 2016.
The effect of Brexit on Gibraltar concerns the status of Gibraltar after withdrawal of the United Kingdom from the European Union. The UK left the EU on 31 January 2020 after having voted to leave in the 2016 referendum and formally notified the EU of its intention to withdraw in March 2017. Gibraltar is not part of the UK, but contrary to all other British Overseas Territories was a part of the European Union like the UK. It participated in the Brexit referendum and it ceased, by default, to be a part of the EU upon the UK's withdrawal.
The United Kingdom (UK) was a member of the European Economic Area (EEA) from 1 January 1994 to 31 December 2020, following the coming into force of the 1992 EEA Agreement. Membership of the EEA is a consequence of membership of the European Union (EU). The UK ceased to be a Contracting Party to the EEA Agreement after its withdrawal from the EU on 31 January 2020, as it was a member of the EEA by virtue of its EU membership, but retained EEA rights during the Brexit transition period, based on Article 126 of the withdrawal agreement between the EU and the UK. During the transition period, which ended on 31 December 2020, the UK and EU negotiated their future relationship.
The European Union Act 2020 is an act of the Parliament of the United Kingdom that makes legal provision for ratifying the Brexit Withdrawal Agreement and incorporating it into the domestic law of the United Kingdom. It is the most significant constitutional piece of legislation to be passed by Parliament of the Second Johnson ministry. The Withdrawal Agreement was the result of Brexit negotiations.
The European Union Withdrawal Agreement Bill 2017–19 was a private member's bill of the Parliament of the United Kingdom to make provision for the holding of a “public vote” (referendum) in the United Kingdom and Gibraltar following the conclusion of negotiations by Her Majesty's Government and the European Union on whether to support the proposed exit deal for the United Kingdom's withdrawal from the European Union or to remain a member state of the EU. The bill was sponsored by English Labour Co-operative MP Gareth Thomas. The bill failed upon the conclusion of the parliamentary session in November 2019, and withdrawal took place on 31 January 2020 without a second referendum.
The Brexit withdrawal agreement, officially titled Agreement on the withdrawal of the United Kingdom of Great Britain and Northern Ireland from the European Union and the European Atomic Energy Community, is a treaty between the European Union (EU), Euratom, and the United Kingdom (UK), signed on 24 January 2020, setting the terms of the withdrawal of the UK from the EU and Euratom. The text of the treaty was published on 17 October 2019, and is a renegotiated version of an agreement published half a year earlier. The earlier version of the withdrawal agreement was rejected by the House of Commons on three occasions, leading to the resignation of Theresa May as prime minister and the appointment Boris Johnson as the new prime minister on 24 July 2019.
A referendum on the Brexit withdrawal agreement, also referred to as a "second referendum", a "rerun", a "people's vote", or a "confirmatory public vote", was proposed by a number of politicians and pressure groups as a way to break the deadlock during the 2017–19 Parliament surrounding the meaningful vote on the Brexit deal.
Below is a timeline of major events concerning Brexit: from the referendum until Brexit day on 31 January 2020, and from Brexit day until 1 January 2021.
In the wake of the referendum held in the United Kingdom on 23 June 2016, many new pieces of Brexit-related jargon entered popular use.
Following the referendum in the United Kingdom on its membership of the European Union on 23 June 2016, polling companies continued to use standard questions in order to gauge public opinion on the country's relationship with the EU. Opinion polling overall showed an initial fall in support for Brexit from the referendum to late 2016, when responses were split evenly between support and opposition. Support rose again to a plurality, which held until the 2017 general election. Since then, opinion polls tended to show a plurality of support for remaining in the EU or for the view that Brexit was a mistake, with the estimated margin increasing until a small decrease in 2019. This seems to be largely due to a preference for remaining in the EU among those who did not vote in 2016's referendum. Other reasons suggested include slightly more Leave voters than Remain voters changing how they would vote and the deaths of older voters, most of whom voted to leave the EU.
EU portal · 
UK portal 