Most of the blood found inside the silencer did not match Sheila's blood, in fact the court of appeal (2002) was prepared to accept that much of this other blood originated from the other victims, namely, Ralph and June Bamber...
Yet, according to blood expert, John Hayward, the blood group results obtained from examination of the small dried flake, had an absence of AK2-1 (June Bambers), which he would have expected to find if any bodys blood had mixed with hers inside the silencer, its (AK2-1) absence ruling out a mixture of Sheila's and Junes bloods, even though the blood from victims had to pass through the small aperture on the silencers end cap, and pass through many cavities between the top washer and 17 internal baffle plates...