Plot: Question Time returns for a new series with a special programme - ten years on from the September 11 attacks. On the panel: Defence Secretary Liam Fox, former Foreign Secretary David Miliband, the leading advocate of regime change in Iraq Richard Perle, anti-war campaigner Tariq Ali, American-born playwright Bonnie Greer and Christina Schmidt, whose husband Olaf, a British Army bomb disposal expert, was killed in Afghanistan