Over the course of two years, filmmaker Jamie Roberts meets those spreading extremist Islamic fundamentalism in Britain, including a bouncy castle salesman who is now one of the world's most wanted men.

Cast:Abu Rumaysah, Khuram Butt, Jamie Roberts, Mohammed Emwazi, Mohammed Shamsuddin, Abu Haleema,

Genre:Documentary,

country:United Kingdom,

Production:Mentorn Media, Channel 4 Television,