EU referendum 'within a year': David Cameron fast-tracks vote on Britain's membership of European Union to June 2016

David Cameron is set to hold the in-or-out referendum on Britain's future membership of the European Union in June next year and will announce the fast-tracked date as the centrepiece of his party's annual conference in October.

Although the Queen's Speech in May promised the British electorate would be given its first chance since 1975 to have a say on EU membership, the Government did not name a date for the vote, only that it would be held before the end of 2017. Chancellor George Osborne was believed to be keen for the referendum to be held later rather than sooner to maximise chances of securing the best possible deal for Britain, but the Prime Minister has now calculated that a 2016 vote will give him a better chance of promoting what may end up being a limited package of EU reforms, and of highlighting the economic risks Britain could face if it left the EU.

The Independent on Sunday has learned that Mr Cameron has decided to pencil in June of next year. The source insisted that the 2016 date, and the parliamentary bill to approve it, would not prove to be a barrier in the House of Lords.

The recent turmoil in Greece, and the concerted efforts by member states to keep Greece in the euro and inside the EU, were also described as being "influential" over Downing Street's recalculation of the referendum date. The reluctance in Brussels to allow a member state to leave the European project has encouraged government leaders to believe that the reforms they are seeking will be granted. However, the Prime Minister has, according to senior sources, now accepted there is only a limited chance of securing changes to the EU's governing rules contained in the Lisbon treaty.

Downing Street sources confirm Mr Cameron is now confident that European leaders are embracing the need for change and want Britain to continue playing a leading role in the eurozone. One senior source said: "Polls show that support for remaining inside the EU is the highest it's been for a quarter of a century. The PM has already made his case to all 27 EU leaders and a vote held next year or the year after will not affect the outcome."