Security consultant Philip Campbell Smith is alleged to have used a Trojan horse to hack into a computer belonging to Ian Hurst, a former British army intelligence officer who handled IRA informers in Northern Ireland.
The BBC claims that computer hackers were hired by private investigators to spy on politicians and the military.
And who benefited from the hacking? The British press.
British police are investigating possible cases of computer hacking, in the ongoing probe into the activities of The News of the World and News International.