This programme focuses on the period 1969-1975. As the IRA launched its terror campaign in the early 1970s, Britain realised that intelligence gathering would be the key to countering their threat. Included in this part are revelations about the covert operations carried out by the army, including the story of how the security services discovered that the IRA had bugged the army’s Northern Ireland headquarters and how they captured key IRA figures involved with the bugging.