Published Tuesday, 28 September 2010
It is understood the man is a former so-called brigadier in the terror group.
He will become the highest ever UVF man to give evidence against his former colleagues.
Loyalist sources say the man has agreed to co-operate with the PSNI by naming UVF men who carried out some of the most notorious murders of the Troubles in north Belfast.
They include a spate of murders carried out by the Mount Vernon UVF led by Mark Haddock.
It is reported he is being held in solitary confinement at Maghaberry Prison near Lisburn.
Loyalists are said to be bracing themselves for a new spate of arrests. It is unclear if the arrests will take in the Shankill Road-based leadership of the UVF.
© UTV News