It is rare to get an insider's perspective on the emergence of al-Qaeda. It is also rare to get a glimpse of the world of spies and agents. To provide both is incredibly unusual. Omar Nasiri - not his real name but one chosen to protect his identity - says he spent seven years working as an agent for European intelligence services and as an al-Qaeda operative, part of the time in the UK. He provides a unique insight into how al-Qaeda was far more organised, coherent and determined in the 1990s than was appreciated at the time. Jihad militants...