Intelligence provided by an IRA informer known as Infliction was regarded as of “mixed reliability”, a senior MI5 officer claimed today.

DISGRACED former MI5 officer David Shayler claimed yesterday that he was told an IRA informer who alleged Sinn Féin’s Martin McGuinness told him he fired the first shot on Bloody Sunday was a “bullshitter”.

EX-MI5 agent David Shayler, who was jailed in Britain for breaching the Official Secrets Act, vowed to fight to clear his name after leaving prison on early release yesterday.

RENEGADE British spy David Shayler was yesterday sentenced to six months in prison after he was convicted of revealing security secrets.

Renegade MI5 agent David Shayler has arrived at court promising to put the British state on trial.