Adam, since you like talking about AM this is for you. Looks like he had one post murders, that's for sure as per Roger Wilkes.
And some info about Eaton which will make some here "orgasmic" with joy as relatives and Mugford are always hot topics for those concerned 😁
Obviously the AM would have switched on before Bamber woke.
He was upstairs, probably behind a closed door, sleeping 'like a log'.
Nevill would have left a message - proof for Bamber. Or not left a message - someone discovers the bodies.
However Bamber rounded the alive suspects down to one by calling the police & confirmed he committed the massacre.