LONDON, ENGLAND - NOVEMBER 12:  Citibank,  Barclays and HSBC headquarters buildings at Canary Wharf on November 12, 2014 in London, England. Five banks have been fined £2 billion by financial regulators in the United Kingdom for manipulation of foreign exchange rates. A separate investigation into Barclays is still ongoing.   (Photo by Peter Macdiarmid/Getty Images)