The point of this thread was to try and stop outlandish theories and try and stick to what actualy was cold hard facts .
I dont think its worked lol
Here is a theory that is even more ridiculous and circumstantial.
David Boultflour Finds out that the bambers own most of his land and are leasing it back he was previously unaware of this. He thinks he and his family have been hard done by. He hates the Bambers June and her religious views piss him off and sheila and Jeremy are not blood and he thinks sheila is off her head and does not like Jeremy at all and his lifestyle and hate that he will inherit most of his land.
He knows about the kitchen window so on the night in question he uses it hes the one that murders them and try's to make it look like a staged suicide so that he can implicate Jeremy at a later stage.
He is the one that calls Jeremy from the farm and says sheila gone mad he keeps the phrase short hoping that that Jeremy thinks its his dad then rings off.
He then goes home waits for the police to find the silencer that he has placed in the box to make the police think the suicide was staged . When they dont find it he then has to change plan and he says he finds it. Pointing the guilt to Jeremy.
This of course is not what happened but we need to stop guessing what happened and focus on actual evidence and facts .
Which the conclusion would be Jeremy probably did it but there is enough doubt to say the conviction unsafe