Fulton also told how he helped develop a light-sensitive remote control device for booby-traps for the IRA with his handlers' full knowledge. The detonation equipment was set off by photographic flash units. In the video he says he made so many bombs - all of which he told his handlers about - that he lost count. Fulton also names intelligence handlers in Customs and Excise and C16 - the RUC anti-racketeering unit - who he warned about IRA drug deals. Again, he says, no action was taken.

Carlin, one of the other army agents in the video, tells how he befriended senior republicans, including Martin McGuinness. Carlin eventually became McGuinness's press officer and the treasurer of Sinn Fein in Derry.

Carlin says that, when his cover was eventually blown and the IRA worked out he was an informer he was flown out of Northern Ireland on, Margaret Thatcher's private jet. Last week, Fulton told the Sunday Herald that his handlers in the FRU told him that his illegal undercover work had been sanctioned in 1980 by the Thatcher cabinet.

Army and intelligence sources have reacted with horror to news that the video is to be released before the autumn. One said: "Irrespective of what members of the Army and the security services are alleged to have done, nobody should consider naming them publicly. This puts them at serious risk from IRA attack. It's a disgraceful gambit.

"It is even more damaging and dangerous to go around naming the family members of security personnel. But there isn't a lot we can do about it. If they are doing this in the Irish Republic it is completely out of our control."
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