Silencer could not have been fitted to the Bamber rifle
If, as the police allege, there was only one gun found in the bedroom, and it was found on top of Sheila's body, by the time they got into the bedroom, at 8:30am, it must follow that Sheila removed the rifle from its original position at 7:15am, of leaning up against the broom window, and she used it to commit suicide, by shooting herself by use of it, under the chin. If the police found that rifle in the bedroom, as alleged, minus a silencer, there is no way on gods earth, that Jeremy, or any as yet unidentified killer, could have removed the silencer from the end of the guns barrel, after 7:15am, and taken it all the way downstairs, to conceal it in the gun cupboard, and then go back upstairs to stage manage Sheila's body, to make it look like she shot herself, and committed suicide, by use of the Bamber rifle, minus the silencer, when all along the silencer had been used on that gun, to fire the fatal bullet under the chin...
There would have been no such opportunity for anyone to have been able to remove the silencer between the time WPC Julia Jeapes spotted it leaning up against the bedroom window at about 7:15am, and when Sheila's body ended up on the bedroom floor with the Bamber rifle on top of her body by about 8:30am - it's a s simple as that
The only conclusion which can be drawn, is that Sheila was not shot and killed by use of a gun with a silencer fitted to the end of its barrel, in the bedroom, and her blood did not get into the silencer by a process of backspatter, as alleged by the ballistic expert, otherwise, the police would have found a silencer fitted to the end of the Bamber rifles barrel, when they found Sheila's body in the bedroom with the rifle on top of it...