But surely if the police had moved Nevill from off the floor they would have sat him upright in a chair, and not in such a precariously balanced and undignified position with pyjamas down straddling a chair back and his head jammed in the coal scuttle? I believe PC Collins who reported seeing a woman's body through the kitchen window would only have taken a cursory glance, wary of having his head blown off by a crazy gun-toting Sheila. Nevill was facing downwards and oriented away from the window towards the Welsh Dresser, with long unkempt hair covering his face part-hidden in the scuttle, hence easily mistaken for a female.
And definitely not moved by Sheila. Her friend Tara Tomkinson who saw her only a week before the murders reported that she needed help just getting up from a seated position as she was so weak and worn out.
The lowered position of Nevill's exhausted body with head in the scuttle would have been ideal for delivering those four final bullets, two to the top and two just above the right ear, which is why I think there was so much blood running down the nearside of the scuttle and pooling on the floor there. In other words, Nevill wasn't moved from elsewhere by anyone (the killer or the police) after those shots. Any blood flowing from his earlier jaw and mouth wounds on the left-hand side and from other facial wounds would have drained more into the scuttle itself, imo.
I also think that the kitchen would have been a restricted area, with police, doctor and mortuary staff who arrived later entering through the front door rather than the back so as not to further disturb all the debris on the floor.