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”.

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