In the first of two BBC programmes, Peter Taylor looks at the real world of modern spies. For the first time on television, serving British secret agents talk about their work - from an MI6 agent runner to an MI5 surveillance officer.
This time, Modern Spies investigates how today's spies are recruited and probes the secrets of spycraft, from the sleeper cell to the brush pass and the cut out to the cyber spy.
You can read the transcript for the first ten minutes of the programme here.
