The forensic evidence on Neville can be quite revealing.
Below is a description from the 2002 COA -
41:
Nevill Bamber, who was wearing his pyjamas had been shot eight times. There were two wounds to the right side and two to the top of the head. If not immediately fatal, the combined effect of these four injuries would have been immediate unconsciousness and incapacitation. There was a wound to the left side of the lip and another to the left part of the lower jaw. This injury caused severe fracturing of the jaw, of the teeth in that area and damaged soft tissue in the neck and the larynx. These features of this particular injury and the resultant flow of blood into the mouth meant, in the pathologist's opinion, that Nevill Bamber would not have been able to engage in purposeful talk. There were also gunshot wounds to the left shoulder and a grazing wound above the left elbow.
42.
The examination of Nevill Bamber's body also revealed black eyes and a broken nose, linear bruising to the cheeks, lacerations to the head, linear type bruising to the right forearm, bruising to the left wrist and forearm and three circular burn type marks to the back. The linear marks were consistent with Mr Bamber having been struck with a long blunt object, possibly a gun.
The first thing to notice is Neville was bare footed in his pyjamas ( similar to Sheila). This strongly suggests he had gone to bed and had not been out of bed very long. As he would surely be wearing a dressing gown and slippers if he had been up for hours or not gone to bed at all.
The gun shots had all been very accurate. All but two hitting Neville in or around the face. Neville was a moving target. This strongly suggests the shooter was used to handling a gun.
The gun shots upstairs meant Neville was not able to engage in purposeful talk. This means Neville must have phoned Bamber before receiving any shots.
The other injuries Neville received (42) were horrific. Sheila could not have done this while Neville was still alive and fighting back. She had no damage on her or her nightie. So could only have done it after Neville was dead. Which is a warped idea. But even then evidence of this would be on her.
The injuries to Neville were so horrific that it is not certain Sheila would have the power to commit these injuries to Neville. Even on a dead Neville. And she would not have had the time before the police arrive. Besides which Sheila and Neville had a good relationship.
It is much more likely that Bamber committed the injuries in (42) while hyped up and fighting a very much alive Neville. Giving him a brutal beating, which at the time he had no choice but to do, and then shooting him again. Bamber being padded up and avoiding injuries. And able to dispose of clothes if necessary.
Generally the forensic evidence highlights that Neville had got out of bed and did not put slippers or a dressing gown on. The gun shot accuracy and severe beating of Neville shows Bamber was the killer rather than Sheila.