A convicted murderer claims he spent 26 years behind bars for a crime he did not commit – and will continue fighting to prove his innocence. Ever since Paul Cleeland was jailed in 1973, doubts have been cast over the case and the evidence that landed him in prison. Mr Cleeland, of Folkestone, was convicted of murder by shooting friend and partner-in-crime Terry Clarke following a fight two years earlier. But many believe the killing is far from an open-and-shut case of crime and retribution, claiming he has suffered a gross miscarriage of justice. This has helped fuel Mr Cleeland’s decades-lon…