One of Britain’s biggest companies could face legal action over the $700 billion collapse of Lehman Brothers, a scathing report revealed today. Accountancy giant Ernst & Young failed to challenge the book-keeping 'gimmicks' the American investment bank was using to stay afloat, according to report author Anton Velukas. He concludes that the British firm been 'negligent' and that Lehman could pursue claims against the firm for 'professional malpractice'. It is also revealed that one of the UK's leading law firms gave Lehman the green light to use the accountancy gimmick - known as 'Repo 105' - in the first place....