I would say that Bambers convictions are no longer safe, because the cops and the CPS, and all their prosecution witnesses involved in the Silencer debacle, no longer holds up to scrutiny! Everything to do with that silencer, or those Silencers cannot be treated as valid, because at almost every stage of the police handling of the investigation some dodgy activity or other involving the silencer, blood and paint has been brought to light which must serve to exclude all that regarding the same!
You can't have cops and scientists sending, taking and receiving items of evidential value to the Lab' without a signed exhibit label attached to it, and the item in question being sealed in a proper exhibits bag! There doesn't even exist any police property store records that a silencer had been in police possession throughout the entire period 7th August 1985 until 30th August 1985 ( when it was supposedly sent to the Lab')...