Harold Wilson's Labour Party won the October 1974 United Kingdom general election, with a manifesto promising a referendum on continued British membership of the EEC. Wilson negotiated a number of concessions from the EEC regarding the Common Agricultural Policy, the level of British contribution to the EEC budget, harmonisation of VAT regulations, ongoing Economic and Monetary Union, and the maintenance of parliamentary sovereignty. Wilson announced a referendum on continued British membership of the EEC on 7 January 1975 to be held on 5 June.