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By Guy Faulconbridge and Kylie MacLellan LONDON (Reuters) - A future Labour government is unlikely to hold a referendum on Britain's membership of the European Union this decade, party leader Ed Miliband said in a political gamble that lowers the chances of Britain leaving the 28-member bloc. Seeking to define the battlelines of the 2015 election, Miliband said he wanted to fight Prime Minister David Cameron on the 'cost of living' rather than spooking businesses with the prospect of a British exit from the EU. In sharp contrast to Cameron's promise to reach a new settlement with the EU before holding an in/out vote by the end of 2017, the 44-year-old Labour leader said he would only hold a referendum if more powers were transferred to Brussels. Such a transfer is unlikely at this stage, particularly since future European political and economic integration would probably come within the euro zone, of which Britain is not a member.