On your first point, I very much doubt that Bamber is the only one to have had evidence destroyed. However, as that is now gone, you can't presume A. that he's innocent and such evidence would have shown it or B. there were sinister reasons for the destruction. He has had other research undertaken but should have gone further with it. The stuff carried out in the USA was rendered useless because it was incomplete or just didn't go far enough.
Oh I agree that David misunderstood the 2012 CCRC Judicial Revue judgement.
I have no idea what % of cases have exhibits destroyed? My understanding is that it is the prosecutions (police) responsibility to maintain exhibits indefinitely regardless of whether or not any appeals are pending? I haven't made any assumptions about the destroyed exhibits that's why I said if they hadn't been destroyed they may have ended the circus and sealed his fate. However it was something the appeal court judges took a dim view of to the extent they agreed to rule in JB's favour in the absence of exhibits:
165. In February 1996, the Essex police destroyed many of the original trial exhibits without reference to the appellant or his legal representatives. It might have been necessary for this court to examine the circumstances in which this had happened. The police officer responsible contended that it was done without his appreciating that there was any on-going legal process that might require the further use of the exhibits. However, during argument it was agreed that the court could protect the appellant's position by making assumptions in his favour and that, therefore, it was unnecessary to resolve precisely how this came about.I agree he should have progressed the work carried out by Dr Fowler (silencer/SC's wounds) and Peter Sutherest (scratches/paint). Instead it appears the CT have been spending donations on windows, a fragmented bullet and so-called suicide notes whilst at the same time making a lot of noise about 2 silencers, RB's blood groups and non-disclosure of this, that and the other none of which have a cat in hells chance of assisting JB.