The Brummie punk rocker, 47, has spent the past 30 years behind bars for a murder he claims he did not commit.
UB40 founding member Brian Travers said: “You only have to study the case for five minutes to know that Gary’s conviction is wrong.
“We have no problem getting on board the campaign and would ask the authorities to just step back and look at the guy as a human being.
“His conviction is completely unsafe, they should do what is right and finally send him home. They can do the right thing by releasing him after all these years.”
Gary, from Northfield, was just 17 when he was jailed for a recommended nine years in 1981 for the killing of Edward McNeill in a London squat.
But despite the court sentencing tariff, he has gone on to spend almost 30 years behind bars.
