In this video grab, from left to right, Deputy Prime Minister Nick Clegg, Prime Minister David Cameron and Chancellor of the Exchequer George Osborne during Prime Minister's Questions,

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In this video grab, from left to right, Deputy Prime Minister Nick Clegg, Prime Minister David Cameron and Chancellor of the Exchequer George Osborne during Prime Minister's Questions, in the House of Commons, London, Wednesday Jan. 9, 2013. Top executives have warned British Prime Minister David Cameron that he could damage Britain’s economy if he seeks to renegotiate the terms of its membership of the 27-country European Union. In a letter published in the Financial Times Wednesday, Virgin Group’s Richard Branson, London Stock Exchange head Chris Gibson-Smith, WPP chief executive Martin Sorrell and seven other business leaders challenged Cameron’s plan to renegotiate the U.K.’s membership terms of the 27-country EU and put the matter to a referendum. (AP Photo/PA) UNITED KINGDOM OUT NO SALES NO ARCHIVE less