Lookout was there ever a cal recorded from whf to the police?
If he did phone Jeremy first I don't believe Sheila was an immediate threat/began shooting at that time??
Yes,I believe Neville did call the police ( as another Mr.Bamber ) prior to Jeremy's call to them,who'd also addressed himself as Mr.Bamber.Two Mr.Bamber's didn't take much to cause the confusion that reigned between the officers at EP. I often wondered why Neville had addressed them as the " Keystone Cops ".Perhaps his time as magistrate taught him that.
It hadn't been unusual for Neville to have rung his son to help him calm his sister down,which must have been after Jeremy had moved out of WHF when Sheila was visiting,latterly. Convalescing from clinic ? Too soon in my estimation !
When Neville rang Jeremy,no shots to his father would have been evident at that point,apart from the fact that Sheila may have grabbed the rifle and had been on her way upstairs,then the shooting would have begun.