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A special programme to mark five years since the collapse of Lehman Brothers, the event which triggered the credit crunch. Simon Jack speaks to some of those involved including Britain's finance minister at the time Alistair Darling. He asks Professor Kenneth Rogoff if it was a mistake to let Lehman's go bust. And Tony Lomas from auditors PWC explains how some people are making lots of money from picking over Lehman's corpse. Plus Dr Pippa Malmgren, a former financial adviser to President George W Bush, says the situation now is worse than it was then.