Has the UK held a referendum on European integration before?

The UK has held a referendum on whether to remain a member of the European Community once before. The UK joined the European Economic Community) in 1973 but the question of membership was not then put to a popular vote (instead it was decided in Parliament).

The Labour party won the General Election in 1974 after promising in its election manifesto that it would hold a referendum on whether the UK should continue to be a member (on renegotiated terms) or leave the EU entirely.

The referendum was held on 5 June, 1975. Just over 67% of those who voted cast their vote in support of continued membership, and the UK has remained a part of the European integration project ever since.

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