Fulton's story begins in 1979. He was 19, and had just enlisted in the First Battalion Royal Irish Rangers. Kevin Fulton isn't his real name, but a pseudonym used to protect his identity since turning whistle-blower on the activities of the British military, the RUC and the security services in Ulster's "dirty war". His work for military intelligence has been confirmed by FRU sources.

Fulton's military file quickly found its way onto the desks of the Intelligence Corps, the regiment which includes the FRU. It made interesting reading. Here was a Catholic from Newry, in the heart of a republican strong-hold, who seemed a loyal servant of the Crown. After only a few weeks in the army, Fulton's staff sergeant approached him. "I was told that some guys from military intelligence wanted to speak to me," Fulton says. "They asked me if I'd like to work for them and I said 'no' as I wanted to remain in uniform. They told me to think about the offer. They added that I shouldn't tell anyone about the visit and that if I was asked I should say they were from a military welfare group. The next time we met they asked me if I'd go to Newry with them. We looked through pictures of local characters and I put names to faces, saying if they had a republican background or not."

The two FRU officers, one of whom was Scottish, continued to try and persuade him to work with them. "They confessed they needed guys like me - Catholics from that part of Northern Ireland - in order to get inside the Provos," he says.