David Cameron's 'nods' about Britain severing Brussels ties putting prosperity at risk Labour leader to use CBI speech to warn against hist of exit from EU Claims the UK is 'conveyor belt towards exit with no idea how to get off' Labour has refused to match the promise of giving voters a say on leaving Theresa May says politicians who want to stay in unchanged EU are 'wrong' The Labour leader will use a speech tomorrow to warn the UK is being left increasingly isolated and is now on a 'conveyor belt towards exit with no idea how to get off'. It comes as Home Secretary Theresa May warned that politicians who argue that the UK is better off in the EU 'whatever the terms, are wrong'. Labour leader Ed Miliband, pictured (left) at the Remembrance Sunday ceremony in Whitehall today, will accuse David Cameron (right) of 'giving succour' to the argument that the real answer to Britain's problems is leaving the EU But Labour has refused to match the promise of giving voters a say on leaving the EU. In a speech to the CBI tomorrow, Mr Miliband will accuse the Prime Minister of putting millions of jobs at risk. Every nod and wink to those who want to leave sends a message to potential investors in our country that we are not open for business Labour leader Ed Miliband Mr Miliband will say Britain must build alliances rather than burn them to help change the EU so it works for Britain. 'Under a Labour government, there will be no further transfer of powers to the European Union without the explicit consent of the British people in an in/out referendum,' he will say. But we have seen over the last couple of years that trying to use exit as a threat has simply weakened our influence, not strengthened it. A country making ever-more incoherent demands, ever-more isolated from its partners, is one on the conveyor belt towards exit with no idea how to get off. We have seen it again with the controversy over the EU budget: banging the table one day, then paying up the next. Instead of posturing, Britain should be forging alliances now to make real reform happen and taking our rightful place in forging the future of Europe. He will add: 'I make you this promise: if I am prime minister I will never risk your businesses, British jobs or British prosperity by playing political games with our membership of the European Union. 'We will reform the European Union, not threaten to leave, not pretend that is the answer, not playing fast and loose with Britain's future, Britain's prosperity and your businesses.' Mrs May, the Home Secretary, today suggested Britain should leave the EU unless it changes. Writing in the Sunday Telegraph, Mrs May made a wider plea for major reforms to the way the EU operates to work in the UK's interests.