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This week saw the surprising exit from the English Defence League of its leaders Tommy Robinson and Kevin Carroll. Instrumental in their decision to leave was Essex-born Maajid Nawaz, a former activist for the Islamist organisation Hizb ut-Tahrir. Arrested in 2001 for attempting to revive the group in Egypt, he served four years in a Cairo jail. Today, he has renounced his old beliefs and now runs the Quilliam Foundation, a 'counter extremism' think tank run by former activists. He has also been selected by the Liberal Democrats to fight a marginal parliamentary seat in 2015. Mark Coles looks at his life.

Producer: Ben Crighton.