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By Alistair Smout GLASGOW Scotland (Reuters) - Once mocked for claiming to have saved the world after the 2008 financial crisis, former Labour Prime Minister Gordon Brown may now have the fate of Scotland in his hands. For many English, Scotsman Brown is an unlikely hero. Academic and awkward in front of the camera, he was ranked Britain's most unpopular prime minister in half a century before he led the Labour party to its worst electoral defeat in a generation in 2010. As Prime Minister David Cameron pondered his options in London and sterling fell after a poll showed separatists were on course to win independence, Brown took action.