Today's programme reflected on the conviction of three men for plotting to kill thousands of people by blowing up planes with home-made liquid bombs.
Ken Macdonald, former head of the Crown Prosecution Service and Andy Hayman, former assistant commissioner for specialist operations at Scotland Yard,
looked back at the UK's biggest terror investigation
Beyond this, just how serious is the current terrorist threat? Ed Husain, co-founder of anti-extremism think-tank the Quilliam Foundation, and Dr John Gearson, director for the Centre for Defence Studies at King's College, London,
discussed whether the prosecution of the three three airline bomb plotters shows that British intelligence efforts are neutralising any danger
As one of the world's biggest arms fairs opens in London's Docklands, Dr Dan Plesch, director of the Centre for International Studies and Diplomacy at Soas, and Sir Malcolm Rifkind, former Conservative defence and foreign secretary,
considered whether defence exports can be used as a foreign policy tool
Alan Duncan says his sacking from the Tory front bench was a "sensible decision" after his comments on MPs expenses were secretly recorded.
His friend, the Times columnist Matthew Parris,
commented on Mr Duncan's view that he is "very happy" to take up a new job as shadow prisons minister
And, as the The British Film Institute (BFI) embarks on a three-year project focussing on Britain's industrial heritage, Lee Hall, writer of Billy Elliot, and Patrick Russell, curator of non-fiction at the BFI,
discussed the history of the coal industry as portrayed on film