That being the case, if JB were planning to kill the family, surely making it look as though the threats had come to fruition would have been a much better plan. No need for the confusion of the phone calls, just wait for the scene to be discovered. Also if a panic alarm was fitted I wonder why no one used it?
Hi Caroline,,my guess is the reason why Neville didn't use the panic alarm is because it was Sheila he was dealing with,so he thought he could overcome that,until she grabbed the rifle,of course,in which case,Neville never stood a chance.
You can bet your life,given the " hearsay " that was supposedly said to be believed, by Jeremy,,,that Neville wouldn't have hesitated using the alarm if he'd felt in any danger.
The same if it had been a stranger ( the infamous " hitman " ),a chance burglary,or any stranger,then Neville would have used the alarm.
To me,there's a reason for the alarm to have been fitted,latterly. Why not years prior.? It was a more or less an isolated place housing a middle-aged/elderly couple. I wonder what the real reason was to have suddenly decided.?