United Kingdom European Communities membership referendum, 1975 - wikipedia United Kingdom European Communities membership referendum, 1975 See also : United Kingdom European Union membership referendum, 2016 United Kingdom European Community ( Common Market ) membership referendum The Government has announced the results of the renegotiation of the United Kingdom 's terms of membership of the European Community. Do you think the United Kingdom should stay in the European Community ( the Common Market ) ? Location United Kingdom Date 5 June 1975 ( 1975 - 06 - 05 ) Results Votes % Yes 17,378,581 7001672300000000000 ♠ 67.23 % No 8,470,073 7001327700000000000 ♠ 32.77 % Valid votes 25,848,654 7001997900000000000 ♠ 99.79 % Invalid or blank votes 54,540 6999210000000000000 ♠ 0.21 % Total votes 25,903,194 100.00 % Registered voters / turnout 40,086,677 7001646200000000000 ♠ 64.62 % Results by county Yes No Referendum held : 5 June 1975 Part of a series of articles on the United Kingdom in the European Union Accession 1973 EC enlargement 1975 Referendum Act 1975 EC membership referendum 1972 EC Act UK rebate 2011 EU Act Membership Brand EU EU Four The Euro European Movement UK Nationality law UK Euroscepticism Maastricht Rebels Black Wednesday Officials and bodies EU Committee European Scrutiny Committee Northern Ireland Executive in Brussels EU Representative in London Young European Movement UK UK European Commissioners Permanent EU Representatives Legislation 1972 EC Act 1986 EC ( Amendment ) Act 1993 EC ( Amendment ) Act 1998 EC ( Amendment ) Act 2002 EC ( Amendment ) Act 2008 EU ( Amendment ) Act 2011 EU Act European Parliament Elections 1979 1984 1989 1994 1999 2009 2014 1973 delegation 1st 2nd 3rd 4th 5th 6th 7th 8th Withdrawal 2004 -- 05 EU Bill 2013 -- 14 EU ( Referendum ) Bill 2015 -- 16 EU membership renegotiation 2015 EU Referendum Act 2016 EU ( Referendum ) Act ( Gibraltar ) 2016 EU membership referendum Causes Endorsements Issues Opinion polling Campaigns Organisations advocating and campaigning for a referendum People 's Pledge Labour for a Referendum Leave Vote Leave ( official lead group ) Business for Britain Conservatives for Britain Students for Britain Labour Leave Leave.EU Bpoplive ( cancelled ) Grassroots Out Get Britain Out The Freedom Association Better Off Out Other anti-EU advocacy organisations Bruges Group Campaign for an Independent Britain Remain Britain Stronger in Europe ( official lead group ) Labour In for Britain European Movement UK Other pro-EU advocacy organisations Britain in Europe British Influence Business for New Europe New Europeans Nucleus Project Fear Media coverage Brexit : The Movie In or Out Aftermath Results International reactions Terms of Withdrawal from EU ( Referendum ) Bill 2016 - 17 2016 Conservative Party election 2016 Labour Party election Proposed second Scottish independence referendum The New European European Union ( Withdrawal ) Bill Gibraltar 2017 General Election Triggering of Article 50 & Negotiations R ( Miller ) v Secretary of State for Exiting the European Union ' EU ( Notification of Withdrawal ) Act 2017 UK invocation of Article 50 Brexit negotiations Department for Exiting the EU ( Brexit Department ) Secretary of State ( Brexit Secretary ) Department for International Trade Secretary of State ( International Trade Secretary ) Post-referendum organisations Change Britain More United Open Britain See also United Ireland The United Kingdom European Communities referendum of 1975, also known as the Common Market referendum and EEC membership referendum was non-binding referendum held on 5 June 1975 in the United Kingdom to gauge support for the country 's continued membership of the European Communities ( EC ) -- often known at the time as the `` Common Market '' -- which it had entered on 1 January 1973 under the Conservative government of Edward Heath. Labour 's manifesto for the October 1974 general election had promised that the people would decide `` through the ballot box '' whether to remain in the EC. This was the first national referendum to be held throughout the entire United Kingdom, and remained the only UK - wide referendum until the 2011 referendum on alternative voting was held thirty - six years later and was the only referendum to be held on the UK 's relationship with Europe until the 2016 referendum on continued EU membership. The electorate expressed significant support for EC membership, with 67 % in favour on a national turnout of 64 %. The referendum result was not legally binding, however, it was widely accepted that the vote would be the final say on the matter. In a 1975 pamphlet, the then Prime Minister Harold Wilson said : `` (... ) I ask you to use your vote. For it is your vote that will now decide. The Government will accept your verdict. '' The pamphlet also said : `` Now the time has come for you to decide. The Government will accept your decision - whichever way it goes. '' The February 1974 general election yielded a Labour minority government, which then won a majority in the October 1974 general election. Labour pledged in its February 1974 manifesto to renegotiate the terms of British accession to the EC, and then to consult the public on whether Britain should stay in the EC on the new terms, if they were acceptable to the government. The Labour Party had historically feared the consequences of EC membership, such as the large differentials between the high price of food under the Common Agricultural Policy and the low prices prevalent in Commonwealth markets, as well as the loss of economic sovereignty and the freedom of governments to engage in socialist industrial policies, and party leaders stated their opinion that the Conservatives had negotiated unfavourable terms for Britain. The EC heads of government agreed to a deal in Dublin on 11 March 1975 ; Wilson declared `` I believe that our renegotiation objectives have been substantially though not completely achieved '', and said that the government would recommend a vote in favour of continued membership. On 9 April the House of Commons voted by 396 to 170 to continue within the Common Market on the new terms. Along with these developments, the government drafted a Referendum Bill, to be moved in case of a successful renegotiation. The referendum debate and campaign was an unusual time in British politics and was the third national vote to be held in seventeen months. During the campaign, the Labour Cabinet was split and its members campaigned on each side of the question, an unprecedented breach of Cabinet collective responsibility. Most votes in the House of Commons in preparation for the referendum were only carried thanks to opposition support, and the Government faced several defeats on technical issues such as the handling and the format of the referendum counts. Finally, although the Government declared in advance that it would comply with the result, the referendum itself was not legally binding upon the government. Contents 1 Background 2 Legislation 3 Referendum question 4 Campaigning 4.1 Yes campaign ( Britain In Europe ) 4.2 No campaign ( National Referendum Campaign ) 4.3 Official party positions 4.4 The campaign, funding and media support 5 Counting areas 6 Result 6.1 Results by United Kingdom constituent countries 7 TV coverage 8 Reactions and consequences 9 Thirty - year rule 10 See also 11 Further reading 12 References 13 External links Background Labour Prime Minister Harold Wilson At the time of the referendum, nine countries were members of the European Communities National and regional referendums held within the United Kingdom and its constituent countries Northern Ireland border poll 1973 United Kingdom EC referendum Scottish Devolution referendum 1979 Welsh Devolution referendum 1979 Scottish Devolution referendum 1997 Welsh Devolution referendum 1997 Greater London Authority referendum 1998 NI Good Friday Agreement referendum 1998 NE England Devolution referendum Welsh Devolution referendum 2011 United Kingdom AV referendum 2011 Scottish Independence referendum 2014 United Kingdom EU referendum 2016 See also : Accession of the United Kingdom to the European Communities and European Communities Act 1972 ( UK ) When the European Coal and Steel Community was instituted in 1952, the United Kingdom decided not to become a member. The UK was still absent when the Treaty of Rome was signed, creating the European Economic Community ( the Common Market ). However, in the late 1950s the Conservative government of Harold Macmillan dramatically changed its attitude and appointed Edward Heath to submit an application and lead negotiations for Britain to enter the Common Market. At a meeting in January 1963, the French president Charles de Gaulle rebuffed and vetoed Macmillan 's request to join the Common Market. Despite the veto, Britain restarted talks with the European Communities countries in 1967 ; and in April 1970, shortly before the 1970 general election campaign, Heath -- who by this time was the Conservative Party leader -- said that further European integration would not happen `` except with the full - hearted consent of the Parliaments and peoples of the new member countries ''. Heath became Prime Minister, and personally led many of the negotiations : he struck up a friendship with the new French president Georges Pompidou, who oversaw the lifting of the veto and thus paved the way for UK membership. Between 21 and 28 October 1971 the House of Commons debated whether or not the UK should become a member of the EC, with then Prime Minister Edward Heath commenting just before the vote : `` But tonight when this House endorses this Motion many millions of people right across the world will rejoice that we have taken our rightful place in a truly United Europe ! '' The House of Commons voted 356 - 244 in favour of the motion, with the Prime Minister commenting straight afterwards on behalf of the house. `` Resolved, That this House approves Her Majesty 's Government 's decision of principle to join the European Communities on the basis of the arrangements which have been negotiated. '' No referendum was held when Britain agreed to an accession treaty on 22 January 1972 or when the European Communities Act 1972 went through the legislative process, on the grounds that to hold one would be unconstitutional. The United Kingdom joined the European Communities on 1 January 1973, along with Denmark and the Republic of Ireland. This would later became the European Union. The support of the Conservative Party, under Leader of the Opposition Margaret Thatcher, was essential to the passage of the Government 's European business in the House of Commons. Throughout this period, the Labour Party was divided, both on the substantive issue of EC accession and on the question of whether accession ought to be approved by referendum. In 1971 pro-Market figures such as Roy Jenkins, the Deputy Leader of the Labour Party, said a Labour government would have agreed to the terms of accession secured by the Conservatives. However, the National Executive Committee and the Labour Party Conference disapproved of the terms. In April 1972 the anti-EC Conservative MP Neil Marten tabled an amendment to the European Communities Bill, which called for a consultative referendum on entry. Labour had previously opposed a referendum, but the Shadow Cabinet decided to support Marten 's amendment. Jenkins resigned as Deputy Leader in opposition to the decision, and many Labour MPs abstained on the division. At the February 1974 general election, Labour 's manifesto promised renegotiation of Britain 's terms of membership, to be followed by a consultative referendum on continued membership under the new terms if they were acceptable. In the October 1974 manifesto, this was changed to the promise that Labour would `` give the British people the final say, which will be binding on the Government -- through the ballot box -- on whether we accept the terms and stay in or reject the terms and come out. '' This could be interpreted as including the option of an election in 1975 ; however, Labour won a working majority, and had no need of another general election. Legislation See also : Referendum Act 1975 The government produced a white paper on the proposed referendum on 26 February 1975 which recommended core public funding for both the `` Yes '' and `` No '' sides, voting rights for members of the armed forces and members of the House of Lords and finally a proposed single central count of the votes for the whole country. This white paper was approved by the House of Commons. On 26 March a Referendum Bill was introduced to the Commons with its second reading on 10 April in MPs voted 312 - 248 in favour. Prior to this bill 's passing there was no procedure or legislation within the United Kingdom for holding any such plebiscite. The vote, the only nationwide plebiscite to be held in the UK during the 20th century, was of constitutional significance. Referendums had been widely opposed in the past, on the grounds that they violated the principle of parliamentary sovereignty. The first major referendum to be held in any part of the UK had been the sovereignty referendum in Northern Ireland in 1973. The issue of how the votes were to be counted caused much division as the Bill went though Parliament. The Government were of the opinion that as it was substantially different from that of a general election and that as a national referendum the United Kingdom was a single constituency and favoured an unprecedented single national count of all the votes for the whole country to take place at Earls Court in London over several days with a single declaration of the final result by the National Counting Officer ( later in the legislation the title was changed to Chief Counting Officer ) but the proposal did n't attract the wider support of the Labour Party or the opposition parties ; the Liberal Party favoured individual counts in each of the parliamentary constituencies and tabled an amendment but was defeated by 263 to 131 votes in the House of Commons ; however, another amendment in the Commons -- tabled by Labour MP Roderick MacFarquhar -- which sought to have counts by administrative regions ( the post-1974 county council areas ) won cross-party support, and was carried by 272 to 155 votes. The Act did not specify any national supermajority of `` Yes '' votes for approval of the terms ; a simple majority of 50 % + 1 vote would suffice to win the vote. It received royal assent on 8 May 1975, just under a month before the vote took place. During the legislative process, the Government also held informal talks with the Governments of the Isle of Man, Jersey and Guernsey to discuss the possibility of holding simultaneous referendums of their own on continued EC membership ; however, the idea was dropped because the UK Parliament had no jurisdiction to pass or impose legislation on those islands, being as they were ( and are ) Crown dependencies. Referendum question The question that was asked to the British electorate that was set out in the Act was : The Government has announced the results of the renegotiation of the United Kingdom 's terms of membership of the European Community. Do you think that the United Kingdom should stay in the European Community ( the Common Market ) ? permitting a simple YES / NO answer ( to be marked with a single ( X ) ). The question that was used was one of the options in the Government White Paper of February 1975, although during the passage of the Referendum Bill through Parliament, the Government agreed to add the words `` Common Market '' in brackets at the end of the question. It should be noted that the referendum took place 25 years before the passing of the Political Parties, Elections and Referendums Act 2000 by the then Labour Government of Tony Blair, which introduced into British law a general procedure for the holding of UK - wide referendums with the creation of the Electoral Commission which could oversee such votes and also test and research proposed referendum questions. Campaigning The referendum was called in April 1975 after the renegotiation was formally concluded. Since Prime Minister Harold Wilson 's cabinet was split between supporters and opponents of the Common Market, and since members of each side held their views strongly, he made the decision, unprecedented outside coalition government, to suspend the constitutional convention of Cabinet collective responsibility. Cabinet members would be allowed to publicly campaign against each other. In total, seven of the twenty - three members of the cabinet opposed EC membership. Wilson 's solution was that ministers speaking from the despatch box would reflect government policy, i.e. support for EC membership, but that they would be allowed to speak freely otherwise. This compromise avoided mass dismissals of Cabinet ministers, with only Eric Heffer among all government ministers being obliged to resign, because of his speaking against EC membership in the House of Commons. Yes campaign ( Britain in Europe ) Logo of the Keep Britain in Europe campaign. The `` Yes '' campaign was officially supported by Wilson 's Government and the majority of his cabinet, including the holders of the three other Great Offices of State : Denis Healey, the Chancellor of the Exchequer ; James Callaghan, the Foreign Secretary ; and Roy Jenkins, the Home Secretary. It was also supported by the majority of the Conservative Party, including its newly elected leader Margaret Thatcher -- 249 of 275 party members in Parliament supported staying in the EC in a free vote in April 1975 -- the Liberal Party, the Social Democratic and Labour Party, the Alliance Party of Northern Ireland and the Vanguard Unionist Progressive Party. No campaign ( national referendum campaign ) Logo of the Out into the World campaign by the National Referendum Campaign. Tony Benn, Secretary of State for Industry, was one of the senior figures in the No campaign. The influential Conservative Edward du Cann said that `` the Labour party is hopelessly and irrevocably split and muddled over this issue ''. The `` No '' campaign included the left wing of the Labour Party, including the cabinet ministers Michael Foot, Tony Benn, Peter Shore, Eric Varley, and Barbara Castle who during the campaign famously said `` They lured us into the market with the mirage of the market miracle ''. Some Labour `` No '' supporters, including Varley, were on the right wing of the party, but most were from the left. The No campaign also included a large number of Labour backbenchers ; upon the division on a pro-EC White Paper about the renegotiation, 148 Labour MPs opposed their own government 's measure, whereas only 138 supported it and 32 abstained. `` Many Conservatives feel the European Community is not good for Britain... The Conservative party is divided on it too '', du Cann -- head of the Conservatives ' 1922 Committee -- added, although there were far fewer Eurosceptic figures in the Parliamentary Conservative Party in 1975 than there would be during later debates on Europe, such as the accession to the Maastricht Treaty. Most of the Ulster Unionist Party were for `` No '' in the referendum, most prominently the former Conservative minister Enoch Powell, who after Benn was the second-most prominent anti-Marketeer in the campaign. Other parties supporting the `` No '' campaign included the Democratic Unionist Party, the Scottish National Party, Plaid Cymru, and parties outside Parliament including the National Front and the Communist Party of Great Britain. Official Party positions Conservative and Liberal Party conferences consistently supported EC membership for several years up to 1975. At a Labour Party conference on 26 April 1975, the Labour membership rejected continuing EC membership by almost a 2 : 1 margin. Tony Benn said, ' We have had a conference and the decision is clear... It is very clear that there now must be a move for the Labour Party to campaign '. The majority of the Labour Party leadership was strongly for continuing membership, and the margin of the party vote was not a surprise, since only seven of forty - six trade unions present at the conference supported EC membership. Prior to the conference, the party had decided that if the conference voted by a margin of 2 : 1 or more in favour of a particular option, it would then support that position in the referendum campaign. Otherwise, the ' party machine ' would remain neutral. Therefore, the Labour Party itself did not campaign on either side. For a `` Yes '' vote No official party position For a `` No '' vote Conservative Party Liberal Party Social Democratic and Labour Party Alliance Party Vanguard Unionist Progressive Party Labour Party Scottish National Party Plaid Cymru Ulster Unionist Party National Front Communist Party of Great Britain The campaign, funding and media support The government distributed pamphlets to every household in Britain written by the official Yes and No campaigns, together with its own pamphlet which argued in support of EC membership. According to this pamphlet, `` the most important ( issues in the renegotiation ) were FOOD and MONEY and JOBS ''. During the campaign, almost the entire mainstream national British press supported the `` Yes '' campaign. The left - wing Morning Star was the only notable national daily to back the `` No '' campaign. Television broadcasts were used by both campaigns, like party political broadcasts during general elections. They were broadcast simultaneously on all three terrestrial channels : BBC 1, BBC 2 and ITV. They attracted audiences of up to 20 million viewers. The `` Yes '' campaign advertisements were thought to be much more effective, showing their speakers listening to and answering people 's concerns, while the `` No '' campaign 's broadcasts featured speakers reading from an autocue. The `` Yes '' campaign enjoyed much more funding, thanks to the support of many British businesses and the Confederation of British Industry. According to the treasurer of the `` Yes '' campaign, Alastair McAlpine, `` The banks and big industrial companies put in very large sums of money ''. At the time, business was `` overwhelmingly pro-European '', and Harold Wilson met several prominent industrialists to elicit support. It was common for pro-Europeans to convene across party and ideological lines with businessmen. John Mills, the national agent of the `` No '' campaign, recalled : `` We were operating on a shoe - string compared to the Rolls Royce operation on the other side ''. However, it was also the case that many civil society groups supported the `` Yes '' campaign, including the National Farmers Union and some trade unions. Much of the `` Yes '' campaign focused on the credentials of its opponents. According to Alastair McAlpine, `` The whole thrust of our campaign was to depict the anti-Marketeers as unreliable people -- dangerous people who would lead you down the wrong path... It was n't so much that it was sensible to stay in, but that anybody who proposed that we came out was off their rocker or virtually Marxist. '' Tony Benn controversially claimed there had been `` Half a million jobs lost in Britain and a huge increase in food prices as a direct result of our entry into the Common Market '', using his position as Secretary of State for Industry as an authority. His claims were ridiculed by the `` Yes '' campaign and ministers ; the Daily Mirror labelled Benn the `` Minister of Fear '', and other newspapers were similarly derisive. Ultimately, the `` No '' campaign lacked a popular, moderate figure to play the public leadership role for their campaign that Jenkins and Wilson fulfilled in the `` Yes '' campaign. Counting areas The referendum was held nationally across all four countries of the United Kingdom as a single majority vote in 68 counting areas under the provisions of the Referendum Act 1975, for which the then administrative counties of England and Wales and the then newly formed administrative regions of Scotland were used with Northern Ireland as a single counting area. The following table shows the breakdown of the voting areas for the referendum within the United Kingdom. Country Counting areas United Kingdom Referendum declaration ; 68 counting areas Constituent countries Counting areas England 47 counting areas Northern Ireland Single counting area Scotland 12 counting areas Wales 8 counting areas Result See also : Results of the United Kingdom European Communities membership referendum, 1975 Results by nation. Voting in the referendum took place across the United Kingdom on Thursday 5 June between 07 : 00 and 22 : 00 BST. All counting areas started their counts the following day on Friday 6 June at 09 : 00 BST. The final result was announced late on Friday 6 June just before 23 : 00 BST by the Chief Counting Officer ( CCO ) Sir Phillip Allen at Earls Court Exhibition Centre in London, after all 68 counting areas had declared their totals. With a national turnout of 64 % across the United Kingdom, the target to secure the majority win for the winning side was 12,951,598 votes. The decision by the electorate was a decisive `` Yes '' to continued EC membership, which won by a huge majority of 8,908,508 votes ( 34.5 % ) over those who had voted `` No '' to reject continued membership. In total, over two - thirds of voters supported continued EC membership. 67.2 percent voted Yes and 32.8 percent voted No. At council level, support for EC membership was positively correlated with support for the Conservative Party and with average income. In contrast, poorer areas that supported Labour gave less support to the question. Approval was well above 60 % in almost every council area in England and Wales, with the strongly Labour - supporting Mid Glamorgan being the exception. Scotland and Northern Ireland gave less support to the question than the British average. Once the voting areas had declared, their results were then relayed to Sir Philip Allen, the Chief Counting Officer, who later declared the final result. All the counting areas within the United Kingdom returned large majority votes in favour of `` Yes '' except for two Scottish regions, the Shetland Islands and the Western Isles, which returned majority votes in favour of a `` No '' vote. United Kingdom European Communities membership referendum, 1975 National result Choice Votes % Yes 17,378,581 67.23 % No 8,470,073 32.77 % Vaild votes 25,848,654 99.78 % Invalid or blank votes 54,540 0.22 % Total votes 25,903,194 100.00 % Registered voters and turnout 40,086,677 64.67 % Referendum results ( without spoiled ballots ) : Yes : 17,378,581 ( 67.2 % ) No : 8,470,073 ( 32.8 % ) ▲ Results by United Kingdom constituent countries Constituent country Electorate Turnout ( % ) Yes No Votes % Votes % England 33,356,208 64.6 % 14,918,009 68.7 % 6,812,052 31.3 % Wales 2,011,136 66.7 % 869,135 64.8 % 472,071 35.2 % Scotland 3,688,799 61.7 % 1,332,186 58.4 % 948,039 41.6 % Northern Ireland 1,030,534 47.4 % 259,251 52.1 % 237,911 47.9 % Tv coverage Both the BBC and ITV provided coverage throughout the following day, and the BBC programme was presented by David Dimbleby and David Butler. There were several programmes throughout the day. Part of the coverage was repeated to mark the 30th anniversary of the referendum in June 2005, and was also shown to mark the 40th anniversary in June 2015 on the BBC Parliament channel and was to be shown again to mark the 41st anniversary ahead of the 2016 EU Referendum. Reactions and consequences On Friday 6 June 1975 at 18 : 30 BST the Prime Minister, Harold Wilson, gave his reaction outside 10 Downing Street as counting continued, although by this point the result was clear : ' The verdict has been given by a vote with a bigger majority than has been received by any Government in any general election. Nobody in Britain or the wider world should have any doubt about its meaning. It was a free vote, without constraint, following a free democratic campaign conducted constructively and without rancour. It means that fourteen years of national argument are over. It means that all those who have had reservations about Britain 's commitment should now join wholeheartedly with our partners in Europe, and our friends everywhere to meet the challenge confronting the whole nation. ' Enoch Powell gave this comment to the result in a newspaper a few days after the referendum : ' Never again by the necessity of an axiom, will an Englishman live for his country or die for his country : The country for which people live and die was obsolete and we have abolished it. Or not quite yet. No, not yet. The referendum is not a `` verdict '' after which the prisoner is hanged forthwith. It is no more than provisional... This will be so as long Parliament can alter or undo whatever that or any other Parliament has done. Hence those Golden words in the Governments Referendum pamphlet : `` Our continued membership would depend on the continuing assent of Parliament ''. ' Roy Jenkins said ' It puts the uncertainty behind us. It commits Britain to Europe ; it commits us to playing an active, constructive and enthusiastic role in it '. Tony Benn said, ' When the British people speak everyone, including members of Parliament, should tremble before their decision and that 's certainly the spirit with which I accept the result of the referendum '. Jenkins was heavily rewarded for successfully leading the campaign for Britain to remain a member of the European Communities when two year later he became the first and to date only British politician to hold the post of President of the European Commission which he held for four years from 1977 - 81. The result strengthened Harold Wilson 's tactical position, by securing a further post-election public expression of support for his policies. According to Cook and Francis ( 1979 ), ' The left of his party had been appeased by the holding of a referendum, the right by its result '. Following the result, the Labour Party and British trade unions themselves joined European institutions, such as the Socialist Group in the European Parliament, to which they had been reluctant to commit before public approval of EC membership. In the House of Commons, the issue of Europe had been effectively settled for two years, until the debate about direct elections to the European Parliament began in 1977. The result went on to provide a major pro-European mandate to politicians, particularly in the UK Parliament, for the next forty - one years until the 2016 EU membership referendum was held on Thursday 23 June 2016 with the UK voting by 51.9 % to 48.1 % to leave the European Union. On that occasion the relative difference of enthusiasm for membership was reversed -- with England and Wales voting to leave, whilst Scotland and Northern Ireland voted to stay. Thirty - year rule The question of sovereignty was discussed in an internal document of the Foreign and Commonwealth Office ( FCO 30 / 1048 ) before the European Communities Act 1972, but was not available to the public until January 2002 under the Thirty - year rule. Among `` Areas of policy '' listed `` in which parliamentary freedom to legislate will be affected by entry into the European Communities '' were : Customs duties, Agriculture, Free movement of labour, services and capital, Transport, and Social Security for migrant workers. The document concluded ( paragraph 26 ) that it was advisable to put the considerations of influence and power before those of formal sovereignty. See also Comparison of results in 1975 and 2016 referendums Accession of the United Kingdom to the European Communities Treaty of Accession 1972 European Communities Act 1972 Brexit Referendums in the United Kingdom United Kingdom general election, February 1974 United Kingdom general election, October 1974 Withdrawal from the European Union United Kingdom European Union membership referendum, 2016 Further reading Butler, D and Kitzinger U. The 1975 Referendum, Palgrave Macmillan UK London and New York, 1996. Milward, A. ' ' The Rise and Fall of a National Strategy : The UK and The European Community : Volume 1, Routledge London and New York, 2002, ( republished 2012 ). Wall, S. The Official History of Britain and the European Community, Volume II : From Rejection to Referendum, 1963 - 1975, Routledge London and New York, 2013. References ^ Jump up to : The Labour Party ( 1974 ). Britain will win with Labour : Labour Party manifesto, October 1974. Retrieved 26 November 2009. Jump up ^ http://www.harvard-digital.co.uk/euro/pamphlet.htm ^ Jump up to : Cook, Chris ; Francis, Mary ( 1979 ). The first European elections : A handbook and guide. London : Macmillan Press. ISBN 0 - 333 - 26575 - 0. Jump up ^ `` European Community ''. Parliamentary Debates ( Hansard ). House of Commons. 18 March 1975. col. 1456 -- 1480. Jump up ^ Crowson, Nicholas J. ( 2007 - 01 - 01 ). The Conservative Party and European integration since 1945 at the heart of Europe ?. Routledge. p. 90. ISBN 9780415400220. OCLC 493677870. Jump up ^ The Labour Party ( 1974 ). Let us work together : Labour 's way out of the crisis : Labour Party manifesto, February 1974. Retrieved 26 November 2009. Jump up ^ Williamson, Adrian ( 5 May 2015 ). `` The case for Brexit : lessons from the 1960s and 1970s ''. History & Policy. History & Policy. Retrieved 13 July 2016. Jump up ^ Bogdanor, Vernon ( 2009 ). The New British Constitution. Oxford : Hart Publishing. ISBN 978 - 1 - 84113 - 671 - 4. Jump up ^ Gay, Oonagh ; Foster, David ( 25 November 2009 ). `` Thresholds in Referendums ''. London : House of Commons Library. Retrieved 8 September 2010. Jump up ^ The seven Common Market opponents in the Cabinet were Michael Foot ( Employment ), Tony Benn ( Industry ), Peter Shore ( Trade ), Barbara Castle ( Social Services ), Eric Varley ( Energy ), William Ross ( Scotland ) and John Silkin ( Planning and Local Government ). ^ Jump up to : `` Conservatives favor remaining in market ''. Wilmington Morning Star. UPI. 4 June 1975. p. 5. Retrieved 26 December 2011. Jump up ^ Butler, David ; Kitzinger, Uwe ( 1996 ). The 1975 referendum. Macmillan Press. pp. 178, 194. ISBN 9780333662908. OCLC 958137188. Jump up ^ HM Government ( 1975 ). Britain 's new deal in Europe. Retrieved 26 November 2009. ^ Jump up to : Cockerell, Michael ( 4 June 2005 ). `` How we were talked into joining Europe ''. The Independent. London. Retrieved 26 November 2009. ^ Jump up to : Cockerell, Michael ( 4 June 2005 ). `` How Britain first fell for Europe ''. BBC News. London. Retrieved 26 November 2009. Jump up ^ `` BBC One London - 6 June 1975 - BBC Genome ''. Genome.ch.bbc.co.uk. Retrieved 2016 - 06 - 07. Jump up ^ `` 1975 : UK embraces Europe in referendum ''. BBC on This Day. London. 6 June 1975. Retrieved 26 November 2009. Jump up ^ FCO 30 / 1048, Legal and constitutional implications of UK entry into EEC ( open from 1 January 2002. ( 1 ) External links Wikimedia Commons has media related to United Kingdom European Communities membership referendum, 1975. Examples of campaigning leaflets used during the 1975 referendum campaign Full text of the accession act Transcript of government pamphlet advocating to vote to stay in the EEC Article `` Jan - Henrik Meyer, The 1975 referendum on Britain 's continued membership in the EEC '' on CVCE website BBC coverage of the Referendum on YouTube Adrian Williamson, The case for Brexit : lessons from the 1960s and 1970s, History and Policy ( 2015 ). Article `` Andrew Glencross ( 2015 ), Looking Back to Look Forward : 40 Years of Referendum Debate in Britain '' https://brexitunderstood.com/1975-referendum/ United Kingdom European Communities membership referendum, 1975 Results Referendum question `` Do you think that the United Kingdom should stay in the European Community ( the Common Market ) ? '' Legislation Referendum Act 1975 Background Treaty of Rome 1970 UK General election UK Accession to the European Communities Treaty of Accession 1972 European Communities Act 1972 1973 EC enlargement 1974 UK General election ( February ) 1974 UK General election ( October ) Campaign organisations Advocating a `` Yes '' vote Britain in Europe Advocating a `` No '' vote National Referendum Campaign Parties For a `` Yes '' vote Conservative Party Liberal Party Social Democratic and Labour Party Alliance Party Vanguard Unionist Progressive Party Neutral / split Labour Party For a `` No '' vote Scottish National Party Plaid Cymru Ulster Unionist Party National Front Communist Party of Great Britain Aftermath European Assembly Elections Act 1978 1979 UK European Parliament election UK rebate Single European Act Black Wednesday Maastricht Treaty Lisbon Treaty UK renegotiation of EU membership, 2016 2016 European Union membership referendum ( 1974 ← ) United Kingdom local elections, 1975 ( → 1976 ) Metropolitan boroughs Barnsley Birmingham Bradford Bolton Bury Calderdale Coventry Doncaster Dudley Gateshead Kirklees Knowsley Leeds Liverpool Manchester Newcastle North Tyneside Oldham Rochdale Rotherham Salford Sandwell Sefton Sheffield Solihull South Tyneside St Helens Stockport Sunderland Tameside Trafford Wakefield Walsall Wigan Wirral Wolverhampton District councils ( England ) Preston Worcester Wyre Forest Ad - hoc election Northern Ireland Constitutional Convention Referendum United Kingdom European Communities membership Results United Kingdom European Union membership referendum, 2016 Renegotiation Results Aftermath Brexit Referendum question `` Should the United Kingdom remain a member of the European Union or leave the European Union ? '' Legislation European Union Referendum Act 2015 European Union ( Referendum ) Act 2016 ( Gibraltar ) Background Treaty of Rome UK Accession to the European Communities Treaty of Accession 1972 European Communities Act 1972 1973 EC enlargement 1975 European Communities membership referendum Single European Act European Communities ( Amendment ) Act 1986 UK rebate Black Wednesday Maastricht treaty European Communities ( Amendment ) Act 1993 European Economic Area European Economic Area Act 1993 Treaty of Amsterdam European Communities ( Amendment ) Act 1998 Treaty of Nice European Communities ( Amendment ) Act 2002 Treaty of Accession 2003 European Union ( Accessions ) Act 2003 European Constitution European Union Bill 2004 - 05 Lisbon Treaty European Union ( Amendment ) Act 2008 European Union Act 2011 European Union ( Referendum ) Bill 2013 -- 14 2014 UK European Parliament election 2015 UK general election Euroscepticism in the United Kingdom Campaign 2016 referendum campaign Issues Opinion polling Endorsements Project Fear Campaign organisations Remain Official campaign Britain Stronger in Europe Other campaigns Labour In for Britain Leave Official campaign Vote Leave Other campaigns Leave.EU Grassroots Out Labour Leave Campaign for an Independent Britain The Freedom Association Better Off Out Get Britain Out Bruges Group Televised debates The European Union : In or Out ( 2014 ) Aftermath International reactions Conservative Party leadership election Labour Party leadership election UK Independence Party leadership election ( September ) UK Independence Party leadership election ( November ) 2017 UK general election Brexit R ( Miller ) v Secretary of State for Exiting the European Union United Kingdom invocation of Article 50 of the Treaty on European Union Brexit negotiations Effect of Brexit on Gibraltar Effects of Brexit on science and technology WTO Option Brexit legislation European Union ( Notification of Withdrawal ) Act 2017 European Union ( Withdrawal ) Bill 2017 - 19 European Union ( Withdrawal ) Bill 2017 - 19 ( Gibraltar ) Related Brexit : The Movie ( 2016 documentary ) Change Britain `` Enemies of the People '' London independence More United The New European ( newspaper ) Open Britain Proposed second Scottish independence referendum United Ireland Status of Akrotiri and Dhekelia and Gibraltar Elections and referendums in the United Kingdom General elections 1801 co-option 1802 1806 1807 1812 1818 1820 1826 1830 1831 1832 1835 1837 1841 1847 1852 1857 1859 1865 1868 1874 1880 1885 1886 1892 1895 1900 1906 1910 ( Jan ) 1910 ( Dec ) 1918 1922 1923 1924 1929 1931 1935 1945 1950 1951 1955 1959 1964 1966 1970 1974 ( Feb ) 1974 ( Oct ) 1979 1992 1997 2001 2005 2015 2017 Next Local elections 1889 1890 1892 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1976 1977 1978 1979 1980 1981 1982 1984 1985 1986 1989 1992 1994 1995 1997 1998 1999 2000 2001 2002 2003 2005 2006 2007 2008 2009 2011 2012 2013 2014 2015 2016 2017 2018 European elections 1979 1984 1989 1994 1999 2009 2014 Referendums 2011 2016 Retrieved from `` https://en.wikipedia.org/w/index.php?title=United_Kingdom_European_Communities_membership_referendum,_1975&oldid=809325035 '' Categories : Referendums related to the European Union 1975 elections in the United Kingdom 1975 referendums 1975 in international relations 1975 in the European Economic Community United Kingdom and the European Union June 1975 events United Kingdom European Communities membership referendum, 1975 Hidden categories : Use British English from September 2012 Use dmy dates from September 2012 All articles with unsourced statements Articles with unsourced statements from February 2016 Wikipedia articles needing clarification from June 2016 Commons category with page title different than on Wikidata Talk Contents About Wikipedia Dansk Deutsch Español Français 한국어 Italiano Nederlands Norsk 中文 Edit links This page was last edited on 8 November 2017, at 12 : 45. 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Question: who was prime minister when britain joined the common market
Answer: Edward Heath