HARDtalk's Stephen Sackur talks to Noman Benotman, a former Libyan jihadist and al Qaeda associate now president of the Quilliam Foundation, an influential voice in the fight against extremism. Hundreds of would-be jihadist fighters and supporters from Britain have journeyed to the self-declared Caliphate established by Daesh or IS, in territory straddling Syria and Iraq. Some have since returned to the UK, adding to the government's fears of a potent home grown extremist threat. Will the British government's intensified deradicalisation efforts work?