I'm not sure why this is difficult for people to understand BUT if there had been a call from Neville there is NO WAY they could have had a case against Jeremy! The call times (for a start) are 5 mins apart on West and Bonnet's log. West obviously got the time wrong because if Jeremy called him at 03:36 and that was the start of his call, there is NO WAY he'd have made it to the crime scene at the time stated. This is getting silly - the call from Neville didn't happen. It's gleamingly obvious. The two logs refer to the same call and if a call from Neville had been made, the relatives would have had to accept Sheila was the culprit.
If there were a call from Nevill to police the only way Jeremy could be the killer would be if he forced Nevill to make such a call and Nevill complied. Nevill would have to assume Jeremy would then kill them and blame Sheila so Nevill would be unlikely to comply. He woudl be better off telling the turth that Jeremy had a gun on him and then Jeremy would have to either kill him knowing he would be blamed or give up and settle for assault charges. Jeremy would not want to take such a risk.
Likewise it would be unlikely for a third party to want them dead and to put Nevill up to such a call to frame Sheila.
So if Nevill did make such a call there woudl be a tremendous burden to establish Nevll was put up to such call.
For a month police believed Jeremy's claims for the most part. There were only a handful of concerns until the lab results came back. If Nevill had called police they would have believed him in full and had no doubts at all until those lab results came back. Given that initial month they still supported the murder suicide theory there is no reason at all they would have hide a call from Nevill.
More importantly there is no evidence of a call from Nevill the supposed evidence it little more than a joke. The supposed evidence is that Bonnett wrote a quote supposedly from Nevill. They say though Bonnett claims the quote was passed to West from Jeremy and then from West to Bonnett that they believe Nevill spoke to Bonnett directly. On what planet is that evidence? It is an unsupported allegation merely.