A POLICE officer who was jailed for seven months for wilful neglect of duty has had his conviction quashed by appeal judges.

David Carmichael had originally been sentenced after a court heard claims he deliberately lied to protect a fellow officer from being investigated for allegations of drink driving.

The case sparked an exchange between Police Scotland Chief Constable Sir Stephen House and Sheriff Principal Brian Lockhart after the man presiding over the trial, Sheriff Robert Dickson, said there "may be a perceived culture that police officers are willing to prevent the arrest and prosecution of a colleague".

Sir Stephen wrote to Sheriff Principal Brian Lockhart saying he believed the comments were "unsubstantiated" but Mr Lockhart responded that he believed Mr Dickson had "ample evidence" to make the inference.

Former Strathclyde police constable Carmichael had been freed on interim liberation pending an appeal against his conviction and the jail sentence imposed on him.

Sheriff Dickson prepared a report for judges at the Justiciary Appeal Court in Edinburgh posing the question whether on the facts found in the case was he entitled to convict.

Lord Drummond Young, sitting with Lady Clark of Calton and Sheriff Principal Ian Abercrombie QC, ruled that the answer was in the negative.

The senior judge said they would give reasons in writing for the decision later.

Carmichael's counsel, Gordon Jackson QC, said: "This appellant was convicted of a common law offence of neglect of his duty as a police officer."

Mr Jackson said the alleged failure fell into three parts - failure to make full and proper inquiry, failure to follow a procedure requiring a person to reveal who was driver of a car and a false report.

The senior counsel said: "That would be a matter of police discipline but would not be neglect of his duty."