United Kingdom European Constitution referendum

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UK membership of the European Union (1973–2020)
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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
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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
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A referendum was expected to take place in the United Kingdom in 2006 to decide whether the country should ratify the proposed Treaty establishing a Constitution for Europe. However, following the rejection of the Constitution by similar referendums in France in May 2005 and the Netherlands in June 2005, the UK vote was postponed indefinitely. The question was thought to have been settled when the constitution was superseded by the Treaty of Lisbon, which Parliament ratified in 2008 without holding a referendum.