Whilst I don't doubt David's theory that the relatives were behind the framing, having both the means and the motive, there are aspects that, in my view, required collusion of some sorts. Probably,after the fact, but once set in motion the framing can only work with at least tacit collusion from within the police.
One example being the photographic record. It is a matter of record that since the original trial, negative strips have been cut and some disposed of prior to inspections by photograpic experts. It is known that some of those negatives were of the gun cupboard, where the relatives allegedly "found" the silencer.
This "curating" of the photographic record by EP over the last 30+ years didn't only start post trial. None of the relatives could guarantee that pictures showing the interior of the gun cupboard would not be in the record presented to the court. They have since gone missing and their removal led to the CCRC admitting that they are,"of significance to the safety of the conviction."
Who could make sure that the photographic record presented to the court in 1986 did not include certain pictures of the gun cupboard?