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Chuka Umunna, business spokesman for the U.K. opposition Labour Party, left, and Ed Miliband, leader of the U.K. opposition Labour Party, listen to a speaker ahead of his address at Bloomberg LP's European headquarters in London, U.K., on Monday, March 30, 2015. Miliband set out his party's pledges to British businesses, seeking to offset concerns that a Labour government would work against them by reiterating his party's commitment to keeping the U.K. in the European Union. Photographer: Jason Alden/Bloomberg via Getty Images