Belfast Crumlin Road Court heard today an account of life in the secret world of military intelligence,

the like of which hasn't been heard before.

It's the end of January 1992, and Brian Nelson has been awaiting trial for two years.

The double agent had been held in custodial isolation before being taken to court today

for what was being billed as the

army's own Watergate scandal.

Brian walks through a dank underground tunnel to get from Crumlin Road jail to the courthouse,

and he's finally in the dock where he's admitted to 20 criminal charges, including five

for conspiracy to murder. He could face a life sentence. Detective John Stevens is watching,

along with his team and reporter John Ware. The unprecedented case is being heard by Lord

Justice Basil Kelly.

Because Brian's pled guilty, Justice Kelly will hear from just one person,

a character witness who wants to get Brian a lighter sentence.

The witness is deemed highly sensitive and is hidden by a security screen.

He writes his name on a piece of paper for the judge. He'll be known to highly sensitive and is hidden by a security screen.

He writes his name on a piece of paper for the judge.

He'll be known to the court as Colonel J, the man we know as Colonel Gordon Kerr.

I feel a personal, moral responsibility to Brian Nelson because I ordered his re-recruitment in January 1987.

Brian Nelson is a victim of the system to which he was actually very loyal.

His loyalty was to the army and to the security forces, not to the UDA.

An actor's reading Gordon's words.

This is the only time he'll testify in court about the force research unit or through.

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