The SNP was the only party to oppose the parliamentary bill which authorised a referendum on the UK's membership of the EU a year prior. While the SNP campaigned against European Communities membership in the 1975 referendum, it campaigned for Remain alongside Labour, the Liberal Democrats, the Greens and Plaid Cymru, while the Remain campaign was also supported by the UK Government and Prime Minister David Cameron, despite the Conservative Party remaining officially neutral. The UK Independence Party was the only main party in Great Britain to campaign for Leave. The UK as a whole voted for Leave by 52% on the back of English support, with England voting for Leave by 53%, while Scotland voted overwhelmingly for Remain by 62%, alongside Northern Ireland and Greater London. The SNP stated that "a significant and material change in the circumstances that prevailed in 2014, such as Scotland being taken out of the EU against our will" would justify another independence referendum in its manifesto for 2016 elections launched months prior to the EU referendum. Scotland's desire to remain in the EU and the direction undertaken by the Conservative Government since the referendum have driven the SNP campaign for another independence referendum.