Julie was not some tart Jeremy picked up on a bar stool in the Frog and Beans. They had been going out for eighteen months and slept in the honeymoon suite of a top London hotel.
Totally irrelevant.
I don't think Jeremy had met any woman quite like her,
That's speculation on your part, the releationship they had has no bearing on the forensic evidence.
As for the telephone call, Nevill is unlikely to call the very person he thinks is planning a shooting accident with himself the recipient, yet even he baulked at believing the son he had adopted would do away with them all.
Neville never said Jeremy was planning to kill him. Barbara Wilson some 27 years after the event decided to claim Neville said "I must never turn my back on that boy" Hearsay evidence after 27 years from some old lady is as reliable as a plumbers quote.
If the silencer was manufactured evidence this does not in itself render Jeremy innocent, merely that the relatives were desperate to be taken seriously by law enforcement and concocted their own scheme to sex up the evidence,shocking as this course of action may have been.
Of course it does not prove him innocent. However that would cast serious doubt on his guilt. I have never claimed Jeremy is innocent my position on the matter is that there is reasonable doubt, and if there is proof the silencer was manufacture that would create serious doubt.