No more unanswered questions: the telephone call which Jeremy claims to have received from his father which in all likelihood never happened and was just a pretext for him to establish an alibi for himself
What can be asserted without evidence can be dismissed without evidence.
the smashed ceiling light in the kitchen indicative of some fight yet not a scratch on Sheila,
It was a broken lamp shade actually. The ceiling light was still on and lit up when the police arrived. Nevil was already fatally shot and could only use one arm prior to when this "fight" could have take place. This explains no scratches on Sheila and in your case Jeremy also.
No more unanswered questions indeed.
Why did Jeremy's alleged confessions to Julie contain the same false information that the police gave the relative's and the newspapers? She made it up.
Why did Julie tell Susan Battersby in Lewisham Pizza Hut (of all places) that Jeremy hired Mathew McDonald to kill the family? Because she and Jeremy had just split up and she was creating malicious gossip. Good thing Brett Collins was away in Greece when the tragedy unfolded, otherwise there probably would have been not two but three innocent people arrested.
Why did Julie not know if Matthew McDonald had ever entered White House Farm despite claiming to believe he was involved in a crime that takes place inside White House Farm? She made the Mathew McDonald story up.
Why did Julie let Liz call the police? She couldn't admit she was telling lies and as a result let them get out of hand.
Why did Julie say she went to the Bank on her own voluntarily to pay back the money she defrauded from them. When in actual fact she was taken to them by the police and the whole affair was pre-arraigned for her? She is a liar.
Why did the CPS do the above and cleanse her image and not charge her for anything before the trial? They knew she was a problematic witness.
Thats all the key aspects of Julies evidence done and dusted for me. The only unanswered question I have is why Julie disliked Matthew McDonald. But thats not important and wont be wasting any time pondering over it.
As for the silencer. Ann Eaton by her own admission decided in her own mind that JB was guilty by as early as the 8th of August. On the 9th of August she was taken round WHF and shown where Nevil was found. On this occasion she would have seen the jacket hanging up in the kitchen over a part of the mantle that would have made crime scene photos of that spot unlikley. And that is where she alerts the police to the scratch marks the following week after having taken the silencer home with her along with Sheila's bloody underwear and god knows what else.
If the relatives were not so blinded by their own self interest, they would have realised that the bloody underwear in the kitchen along with the tampon stuff left out in the lounge combined with Sheila being found with no underwear and just a tampon demonstates the prologue of the tragedy. But instead Ann Eaton tells the jury she left the knickers at the crime scene and Robert Boutflour thinks the tampon stuff in the lounge is there because Jeremy used tampons the clean the silencer.