Former MI5 officer David Shayler, who was jailed for breaching the Official Secrets Act, has vowed to "fight on" to clear his name when he left jail on early release.

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

An MI5 agent who claimed Sinn Fein’s Martin McGuinness fired the first shot on Bloody Sunday will not have to give evidence to a tribunal of inquiry because of fears for his life, it was announced today.

The British security services have applied for special restrictions to be placed on the evidence of a former MI5 agent who is due to appear before the Bloody Sunday Tribunal in Derry.

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

Sein Fein says doubts cast by a former MI5 officer on claims that Martin McGuinness fired a shot before the Bloody Sunday massacre prove that the allegations are bogus.