Its worth pointing out that their are three possible sources for the blood.
The 1st being the blood AE took home (already covered in this topic)
Jeremy wrote to mike in 2010 saying he believes his relatives contaminated the silencer with Nevil and Junes blood. Since they had access to the scene and AE was cleaning up Nevills blood from the kitchen floor and there was also Junes blood on the door upstairs. Although possible I find it less probable.
Then you have Robert Boutflour using his own blood, also possible but I also find it less probable.
The evidence is it was Sheila's blood. With a remote possibility of it being a mixture of Nevill's & June's.
Doubt there was any blood inside WHF when AE was given access. Carpets had been burned & the crime scene cleared up.
But if there was, I'm sure AE was on her hands & knees trying to scrape dried blood up.
I thought AE knew Bamber had told the police the silencer was not attached to the rifle.