Insight for Sunday 25 January 2015
Former jihadist, Aimen Dean gives a unique insight into the workings of Islamic State.
With the rise of al-Qaeda, he became disillusioned with his comrades’ drift towards terrorism.
(Image: Islamic State flag)
He joined the group – but working undercover for the British government
Despite his defection, he retains a deep network of contacts within Islamic State and shares that knowledge with the BBC World Service's Peter Marshall .