David Cameron is under pressure to change the EU referendum question to make it less biased.
The Electoral Commission has recommended that the question no longer involve 'Yes' and 'No' answers and said voters should instead be asked: "Should the United Kingdom remain a member of the European Union or leave the European Union?"
It said its research and consultation had found that the current question planned - "should the United Kingdom remain a member of the European Union" - was not balanced and favoured the 'Yes' camp.
The Commission has written to the Government and all MPs proposing that they change the question in the next stage of the EU Referendum Bill's passage through Parliament.
The referendum could take place as early as next year if Mr Cameron is successful in winning reforms to Britain's relationship with the EU by the end of 2015.
A change in the question would give a major boost to those campaigning for Britain to leave the EU as it would take away the drawbacks of campaigning on the negative side of the referendum question.
Jenny Watson, chair of the Electoral Commission, said: "Any referendum question must be as clear as possible so that voters understand the important choice they are being asked to make. We have tested the proposed question with voters and received views from potential campaigners, academics and plain language experts.
"Whilst voters understood the question in the Bill some campaigners and members of the public feel the wording is not balanced and there was a perception of bias. The alternative question we have recommended addresses this. It is now for Parliament to discuss our advice and decide which question wording should be used."
This morning Nigel Farage said he was willing to work with "absolutely anyone" to ensure voters opted to leave the EU.
Speaking as Ukip prepared to launch its own 'Brexit' campaign, he ruled out heading the official 'Out' campaign, which will be granted higher spending limits, television broadcasts and will be given a grant.
He told Radio 4's Today programme: "Let’s be clear, I’m not refusing to work with anybody, in fact the opposite, I’ll work with absolutely anyone for us to get a no vote in this referendum," he said.
"All I’m saying is I’m not choosing one side or another, I will work with whichever of them gets the nomination although I have to say privately before we get to that point I hope there is a coming together of the two of them because both of them have got skills.
"There has to be an umbrella group and whoever gets it we’ll work with but I think the unique role that Ukip can play within this is that we’ve got 50,000 members, hundreds of branches across the country and we can do the ground campaign."
Eurosceptic Tory MPs
Eurosceptic Tory MPs
1/7 Owen Paterson
Formerly a cabinet minister, Owen Paterson is now free to make his opinion known on the backbenchers. On the subject of Europe, he does so regularly – claiming recently that the EU referendum was “rigged” in favour of staying in
2/7 John Redwood
A longstanding eurosceptic, Mr Redwood warned last year that businesses that spoke out in favour of EU membership would be punished at the check-outs by anti-EU
3/7 Bill Cash
Awkward squad rebel Bill Cash said last year that he thought the EU had become an undemocratic, German-dominated project. “An increasingly assertive German Europe is at odds with British national interests,” he wrote in the Daily Telegraph
4/7 Philip Davies
From the Conservative party’s hard right wing, Philip Davies has been a longstanding critic of the EU. He founded the Better off Out campaign and is so eurosceptic that Ukip decided not to stand a candidate against him in 2010 because they agreed with him
5/7 Nadine Dorries
Outspoken Tory MP Nadine Dorries has previously advocated an alliance with Ukip. At the height of the Greek crisis in 2013 she said that the EU was “dying on its feet”
6/7 Liam Fox
The former defence secretary is a central figure on the right wing of the Conservative party. He’s long put pressure on David Cameron over EU negotiations
7/7 Zac Goldsmith
A socially liberal eurosceptic, Goldsmith was one of the founding members of the People’s Pledge campaign to get MPs to sign up for an EU referendum. His father ran the Referendum Party, a precursor to Ukip