Aimen Dean was an early member of al Qaeda, swearing an oath of allegiance with Osama bin Laden. In 1998 he was picked up and interrogated by British intelligence. Disillusioned with al-Qaeda's terrorist agenda, he took the dramatic decision to become a spy for MI6 and MI5. He talks to Peter Marshall about the eight years he spent under-cover as a spy in the UK and at the heart of al Qaeda in Afghanistan. He tells his story publicly for the first time.

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