When looking at the case and the murders in particular, Nevills is the one which convinces me that this was not Sheila.
I think you have to look at what parts of the murders the killer is in control and the parts where they are not.
The Twins- Controlled. Vanezis states that one of the boys was shot in an arc which would need a fair degree of skill. The amount of bullets used indicates that the killer was not worried about re-loading. I believe they were killed last.
Sheila- Controlled. Two central close range shots. The location of where her body was found in the main bedroom suggests to me that she was taken into the room at gunpoint. I think she was shot first.
June- First episode- Uncontrolled- Second episode- controlled. The trail of her blood round the bed to where Sheila was found indicates to me that she went to check on Sheila. The final position of her body would indicate that she was either trying to help either Nevill or trying to protect the twins. The second episode shooting inflicted on June was close contact, controlled, almost torturous shooting.
Nevill- First episode- Uncontrolled. Second episode- controlled. Why and How did Nevill and the killer end up downstairs? It seems pretty certain that the killer ran out of ammunition in the main bedroom. If you have planned to murder five people with a gun, i would assume that if you have run out of bullets, you would immediately return to the place where you can get more ammunition, hence the panicked flee to the kitchen. Nevill seems to have pursued quickly enough that the killer couldn't reload in time. Nevills injuries from the scuffle in the kitchen seems to indicate he took one hell of a beating. Loads of linear bruising to his arms and head.
I just don't buy into the fact that he ended up in that chair by chance. Someone being beaten unconscious in an all out assault doesn't just pass out conveniently, sitting in a chair. I think he was put there by the killer so they could reload and shoot him. I think he was shot upright, 4 times in quick succession and slumped forward with his head into the coal scuttle. The angle of the entry wounds of the head shots would indicate that the killer was above, behind and to the right of Nevill. No way did he receive those head shots where his body was found unless the killer knocked down the fireplace to do it. I would also like to state with certainty that those four head shots were all fired in the kitchen. There was no shot on the stairs, even with the presence of a shell case. The shell case on the stairs has been moved whether accidentally or deliberately, who knows but it should be in the kitchen. Any of those four head shots would have killed him very quickly, if not instantly and he would not be moving anywhere voluntarily after receiving any of them.
So, Why put Nevill in a chair to shoot him? Firstly ask yourself why would Sheila put him in a chair to shoot him? If she is going beserk, why would she bother moving him at all. Then again, why would she bother running downstairs to reload? If she was truly deranged why on earth would she care that every victim received a head shot?
Personally, i find the series of murders both planned and botched. It seems to me that the killer got things incredibly right and incredibly wrong. Gaining entry, presumably without detection due to Nevill and June being in bed, but running out of bullets in the bedroom, highlight the inconsistency of the murders. What seems constant are the head shots. It seems almost military or assassin like. All of the head shots were controlled shots. Nevills were in a cluster, June's were close contact and the boys again in a cluster or arc as Vanezis described them. The killer seems to like control and i have no doubt they were planned. I think the control impulse in the killer is why Nevill was placed in that chair. Its almost, a subliminal command to an unconscious Nevill, 'stay there, while i reload'.
Jeremy appears shocked in his statement when the Police tell him they don't have the technology to validate him receiving a call from WHF. I think there was a phonecall but not from Nevill to JB but from the killer to JB. I think that the phonecall was integral to JB's alibi and if there was itemised billing in 1985, Jeremy would not have seen a courthouse, let alone a cell.
The way i see the WHF murders in percentages of who committed the murder is Sheila 0%, Jeremy 40%, Someone else 60%. I need someone to start the Jeremy Bamber third party, theory, forum so i can fit in somewhere!