The bank, led by Sir Keith Whitson, whose abrasive manner has not been mellowed by his recent knighthood, has the biggest exposure to Latin America of UK lenders. Argentina, where HSBC is in for more than £1bn, is already mired in crisis. The contagion has spread to Uruguay, where the banks were last week forced to close their doors. The US has promised a £1bn emergency loan until the International Monetary Fund rides to the rescue.