A decade after British retail banks sounded the retreat from investment banking, they are making more money than ever from a line of business once cowed into submission by Wall Street. On February 20th Barclays, Britain's third-largest bank, said that pre-tax profit last year at its investment bank (now called Barclays Capital) had increased by 55% to more than £2.2 billion, contributing almost a third of the firm's pre-tax profit.
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