Michael O'Brien had always protested his innocence

Mr O'Brien, 32, spent 11 years in prison with Darren Hall, 32, and Ellis Sherwood, 31, after they were convicted of Mr Saunders' murder in 1988.

But in 1999, after a lengthy battle to clear their names, the Court of Appeal quashed the men's convictions.

Mr O'Brien has been at the forefront of a campaign since then to receive a public apology from South Wales Police and he has demanded a full inquiry into the case.

He is now seeking full compensation for his loss of liberty.

Mr O'Brien is one of the founder members of Mojo - Miscarriages of Justice Organisation - which was unveiled in March along with Paddy Joe Hill, one of the Birmingham Six.

In April, South Wales Police confirmed no action was to be taken against any officers connected with the Cardiff Newsagent Three case.

Ellis Sherwood: Freed on appeal

But the force has announced a full review of the murder case.

Mr Saunders was attacked and by robbers outside his home in the Canton area of Cardiff in October 1987.

He died five days later in hospital.

All three men had served 11 years of a life term after being convicted based on Mr Hall 'confessing' to detectives.

During the hearing in December 1999, the Appeal Court heard Mr Hall had a history of telling lies.

Questions were also raised about the conduct of investigating officers, who were alleged to have shown a "systematic disregard" of the rules governing interrogation of suspects.

In February this year, the Crown Prosecution Service announced it would not bring charges against any officers.

South Wales Police also announced that they will review the murder of the Cardiff newsagent.

They have said that all interested parties have been informed of the development, and the review will be carried out by an independent person.