British Prime Minister David Cameron delivers a speech on 'the future of the European Union and Britain's role within it', in central London, on January 23, 2013. Cameron on Wednesday promised to hold a referendum by 2017 giving British people the choice of staying in or leaving the European Union if his party wins the next election. AFP PHOTO / BEN STANSALL (Photo by BEN STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
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