TWO Scots Guardsmen, serving life sentences in Northern Ireland for murdering a teenager while on duty, yesterday lost their latest legal bid for freedom.

Campaigners backing Jim Fisher, 28, from Ayr, and Mark Wright, 24, from Arbroath, last night called on Secretary of State Mo Mowlam to consider their early release as a new climate of peace beckons in the Province.

Yesterday Mr Justice Coghlin, sitting in the High Court in Belfast, rejected the soldiers' application for a judicial review of the Northern Ireland Secretary's refusal to refer their case immediately to the Life Sentence Review Board.

He said they had not made out a sufficient case of procedural impropriety or irrationality to quash the Secretary of State's decision.

The pair - who are still in the Army - will now have to wait until October for the board's next appraisal.

Mrs Isobel Wright said she was ''very disappointed'' at the latest development. But she vowed that the fight would continue to secure the early release of her son and his colleague.

Mr George Foulkes, Labour MP for Carrick, Cumnock, and Doon Valley, said he was not surprised that the latest legal bid had failed.

However, he said he believed a chance of securing the guardsmen's early release remained, given recent peace process developments involving the early release of prisoners who had committed crimes in ''more awful circumstances''.

Mr Foulkes, who will next week discuss with Ms Mowlam the possibility of the soldiers' case being reviewed, said: ''I am certainly not challenging the verdict of the court, but there was no intention to murder and they have been model prisoners.

''Given that other prisoners are being released, and given that the conflict looks to be moving to an end, the climate is right for an early release.''

The two guardsmen were jailed in September, 1992, for shooting 18-year-old Peter McBride, whom they believed was wielding a coffee jar bomb.

At the end of his 18-page judgment, Mr Justice Coghlin granted a declaration that there had been a failure to provide proper and adequate reasons for the decision to distinguish the cases of Fisher and Wright from that of Private Ian Thain. He was convicted of murder and released after serving a shorter time in prison.

The judge said he would remit Fisher and Wright's cases to the Secretary of State ''for further consideration in accordance with the declaration''.

The Secretary of State had decided that Fisher and Wright ought to serve a ''significantly longer term of imprisonment'' to reflect the culpability of their crime, the judge said.

Lawyers for Fisher and Wright had argued they were entitled to immediate release as they had been in prison much longer than two other soldiers convicted of murdering innocent civilians - Private Thain and paratrooper Lee Clegg.

Retired Scots Guard officer General Murray Naylor - chairman of the Fisher and Wright Release Group - said campaigners were disappointed with yesterday's outcome but hopeful that the Northern Ireland Secretary would look at the case again before October.

However, the victim's father, also named Peter McBride, welcomed the judgment. He said: ''I am glad they are staying in jail for another while. We don't expect them to be the only two left in jail if early releases start, but we don't expect them to be the first out.''