Something else if I may, a full re-construction with the same rifle / ammo based on the shell drop positions, number of shots into victims, location of rooms, bodies etc could help determine how and who was most likely responsible.
There are signs of frenzied killings here, which just tips the scales towards Shelia in my view.
Not to mention the kitchen situation with Neville.
I listened to Stan Jones on Essex radio - he didn't really convince me.
How do we know that in a violent and manic rage Shelia wasn't capable of inflicting those wounds on Neville? And how do we know that she didn't cleanse her body before turning the gun on herself?
A reconstruction would have to show both options, ie. a Jeremy Bamber version, and a Shelia Caffell version.
A lot was made by Stan Jones about the way Jeremy Bamber acted after the killings, as far as I am concerned, this meant nothing.