United Kingdom membership of the European Union information
Period of the United Kingdom being a member state of the European Union
Part of a series of articles on
UK membership of the European Union (1973–2020)
Accession
Treaty of Accession 1972
1972 EC Act
1973 enlargement of the EC
1975 referendum
Referendum Act (results)
Treaty amendments
Single European Act, 1986
(UK ratification)
Maastricht Treaty, 1992
(UK ratification)
Treaty of Amsterdam, 1997
(UK ratification)
Treaty of Nice, 2001
(UK ratification)
Treaty of Lisbon, 2007
(UK ratification)
Related:
2011 UK Act on new EU Treaty amendments
EU-related British Acts
Proposed European Constitution referendum
European Union Bill 2004–2005
MEPs for UK constituencies
Members 1973–1979
(elected by parliament)
Members 1979–1984
(1979 election)
Members 1984–1989
(1984 election)
Members 1989–1994
(1989 election)
Members 1994–1999
(1994 election)
Members 1999–2004
(1999 election)
Members 2004–2009
(2004 election)
Members 2009–2014
(2009 election)
Members 2014–2019
(2014 election)
Members 2019–2020
(2019 election)
Women
Officials and bodies
House of Lords EU Committee
House of Commons EU Committee
Permanent EU Representatives for UK
Northern Ireland Executive in Brussels
EU Representative in London
UK European Commissioners
Department for Exiting the European Union
Issues and events
Economy
The Euro
Black Wednesday
UK budget rebate
Nationality law
Euroscepticism in the UK
United Kingdom opt-outs from EU legislation
Maastricht Rebels
Balance of Competences Review
Withdrawal
2015 UK general election
2015–2016 membership renegotiation
2016 EU membership referendum
Vote Leave
Britain Stronger in Europe
Notification of withdrawal
2017 UK general election
Brexit negotiations
Impact of Brexit
Future relationship
Withdrawal agreement
No-deal Brexit
Impact on Irish border
Northern Ireland Protocol
Parliamentary votes
Proposed second referendum
2019 UK general election
EU portal
UK portal
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The United Kingdom (along with the British Overseas Territory of Gibraltar) was a member state of the European Union (EU) and of its predecessor the European Communities (EC) – principally the European Economic Community (EEC) from 1 January 1973 until 31 January 2020. Since the foundation of the EEC, the UK had been an important neighbour and then leading member state, until Brexit ended 47 years of membership. During the UK's time as a member state two referendums were held on the issue of its membership, with the first being held on 5 June 1975, resulting in a vote to stay in the EC, and the second, held on 23 June 2016, which resulted in the vote to leave the EU.
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