I defer to you. It still means Nevill dialled 5 numberson a rotary phone and then waited for JB to wake up, come downstairs and answer. Have you an idea of a reasonably plausible state of affairs that would explain the call itself and what he supposedly said?
But does it? It's still not clear to me what number NB would have needed to dial for JB and vice-versa. I recall in the mid 80's dialling friends within the village using 4 digits and friends in the neighbouring town using 6 digits. I think it depends on the definition of local/exchange?
I believe NB and June had a phobia, for want of a better word, about anyone finding out about SC's mental illness and went to great lengths to hide/deny it. Don't forget SC was the adopted daughter and so to acknowledge SC's mental illness was possibly having to also acknowledge SC's unknown origins/hereditary background/genetics/bad blood/their infertility and b) whether they themselves had in some part caused SC's mental illness by her upbringing/June's mental illness.
Yes NB would have to wait for JB to wake and move himself downstairs to answer. All initial WS's state JB claimed NB said "Sheilas gone crazy shes got the gun". Nothing about please come over. If NB phoned EP emergency number or non-emergency he would need to confirm his name, address, tel number and a brief outline of the situation so it would not be quick. If he phoned EP and said "Sheilas gone crazy shes got the gun" then what? JB was aware of all the details: full name, address, tel number, weapons at WHF and more importantly SC's mental history. Bottom line is no jury would convict someone on the basis that a phone call wasn't made when it can't be proved either way.
Also perhaps NB had experienced a long history of newcomers to WHF getting lost? Its tucked away and not easy to find.