British voters’ appetite for leaving the European Union is gathering momentum, putting the prospect of Brexit on a knife edge, a new poll has found. As David Cameron prepares to travel to Brussels for a crucial European summit to discuss his renegotiation plans, a poll has found that the British public is now evenly split about the prospect of a British exit from the EU. It came as the EU referendum bill last night passed through the House of Lords, meaning that Mr Cameron could potentially hold his vote in June next year. According to the ICM poll for the Vote Leave campaign, when undecided voters are excluded, 50 per cent of voters would choose “Brexit”. It is the first time since 2013 that ICM has found that voters are evenly split. The independent polling company has in recent weeks found that the gap between the “Leave” and “Remain” campaigns is narrowing significantly. According to today’s poll of 2,053 voters, when “don’t knows” are included 42 per cent of people would vote to stay in the EU, with 41 per cent voting to leave. The poll finds that there is a significant shift towards exit when people are asked how they would vote if “freedom of movement” rules allowing EU migrants to live and work in the UK are left unchanged as a result of Mr Cameron’s renegotiation. If freedom of movement remains as it is now, 45 per cent of voters would leave the EU and just 40 per cent would vote to remain, the poll finds. The survey also finds that 65 per cent of those listing themselves as “enthusiastic” about the in-out referendum are “leave” voters.