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By Andrew Osborn LONDON (Reuters) - Prime Minister David Cameron is Britain's most popular major party leader and his Conservative Party the most trusted on the economy after helping revive it. A descendant of King William IV, Cameron, who came to power in a coalition with the centre-left Liberal Democrats in 2010, says he wants to serve another five-year term "to finish the job" of fixing the economy. He also plans to deliver a European Union membership referendum, which he hopes will cure his country and party of its Eurosceptic angst. "The Conservatives are very hard-nosed," Greig Baker, a former Conservative staffer who now runs a public affairs firm called Guide told Reuters.