Fulton split with both the IRA and military intelligence in the mid-1990s after a number of terrorist operations went disastrously wrong. Once his handlers told him to get a mobile phone and a car for a planned hit in 1994 on a senior RUC officer in Belfast. The IRA team was arrested on its way to carry out the murder.

Fulton believes his handlers thought he had outlived his usefulness and deliberately linked him to the operation before tipping off the police about the plan. By then, the army had secured a far more highly-placed mole within the IRA - a man still active and codenamed Stakeknife. Fulton is sure that he was compromised, so the IRA would kill him and believe they were free of informers, allowing Stakeknife to pass top-grade information to the military without risk of being detected.

"If I was dead that would have been the end of it," he says. "There would have been no embarrassment to the army."

From 1995 until now Fulton has been fighting the MoD - demanding they clear his criminal record, give him a new identity, a relocation package and provide a military pension. "If they hadn't screwed me, then I wouldn't be screwing them now," he says. "If the IRA ever find me I'm dead. I accept I'm a marked man, but I intend to take everyone down with me who was in on this - no matter how high up the stink goes."