On what grounds. You have no grounds for doing so.
On what grounds? Seriously? The grounds are the whole 'Nevill must have been unconscious for X amount of time' I don't believe he lay there unconscious and then called Jeremy. I think the whole suggestion is ludicrous and even more, that the police perched him on the chair/coal scuttle as seen in the SC photographs with his PJ's pulled down. WHY?