Thanks I just watched the video, shocking really, it makes me sad this can happen in our country.
The ever reducing amount of negatives and Essex Police "curation" of those negatives is shocking. The following gem from the CCRC cannot be left unremarked.
"As stated above, on the occasions when the negative strips have been cut short the subject matter (with the exception of the gun cupboard) is not of significance to the issues which may affect the safety of the conviction"
The exact protocols used by the CCRC to discern that photographs they hadn't seen from negatives that no longer existed were of no evidential value is something we can only guess at. Even worse though is the admission shoved into brackets as if it doesn't matter.
The tacit admission that the negative strips of the gun cupboard were not only cut short but were of "significance to the issues which may affect the safety of the conviction".
So the CCRC are aware that strips have been cut some time between 2001 and 2012. They apply some mysterious test which shows that the missing negatives are not important, except for the ones that are, but dismiss the ones that are, even though they themselves concede that these missing negatives are of evidential value. No further reasoning is offered.
I am sure that it is all a huge coincidence that the negative strips containing pictures of the gun cupboard have been cut short. I imagine EP and those relatives involved in the "finding of the silencer"

must be disappointed that the pictures showing the gun cupboard were cut short. They would be able to prove once and for all that the silencer had been there all along and that it wasn't a fabrication by dishonest and greedy relatives with the connivance of dishonest officers. If only...

The gun cupboard and its contents are clearly of the utmost importance in this case given the dubious and much disputed chain of custody of the contents of said cupboard. That the CCRC dismiss the fact of the missing negatives without explanation, despite recognising the "significance to the safety of the conviction", does nothing to inspire confidence in either their integrity or competence.