Former PSNI Chief Constable Sir Hugh Orde, told the programme he believed that justice would have been better served if Gordon Kerr, FRU commander from 1986 to 1991, had faced a public trial.
In 1987 Kerr recruited former soldier Brian Nelson as an agent. Nelson's job was to infiltrate the UDA.
Kerr regarded Nelson as his jewel in the crown.

https://en.wikipedia.org/wiki/Gordon_Kerr_(British_Army_officer)