Presented by John Humphrys and Edward Stourton. Greg Wood, Chris Hogg and Robert Peston explain how bad the day's trading was in the global markets. Mike Sergeant reports on the improvement in security in Iraq during General Petraeus' 18 months in charge. Chancellor Alistair Darling says that the economy is going through a stage of unprecedented turbulence. Chris Morris reports from Hyderabad on the impact of the Premier League on the development of Indian football. Thought For The Day with the Right Rev Tom Butler. Lib Dem leader Nick Clegg discusses his speech from the party conference in Bournemouth. Matthew Bishop, of The Economist in New York, and Sir Howard Davies, former chairman of the Financial Services Authority in the UK, discuss the future of AIG. Former American Poet Laureate Donald Hall takes Nicola Stanbridge through some of his favourite poems. MP Fiona MacTaggart and former Foreign Secretary Margaret Beckett discuss the possibility of a leadership contest. Ian Johnston, the president of the Police Superintendents' Association for England and Wales says public support for the police is 'fragile'. Former Liberal leader David Steel and Olly Grender, former director of communications for the Liberal Democrats, discuss how successful Nick Clegg will be. David Freud, former vice-chairman of UBS, and Lord Desai, Professor of Economics at the LSE, discuss whether investment banks are still the 'high priests' of the economy.