You sure this isn't a Press Confrence photo Mike
Looks like a camera lens in the top left corner?
Well, fact of the matter is, Ewen Smiths informant told him in 2003 that PC Whiddon had gione a,long to the desk of DCI 'Taff' Jones, and took possession of a silencer which 'Taff' had been keeping and using as a paper weight and that Whiddon took it along to the force armoury to see if it fitted the guns barrel,and when he carried that exercise out and he found that it did fit, the silencer in question along with the rifle were sent off to the lab' on 20th September 1985...
Now, you only have to use a little bit of common sense, and you must surely realize that Whiddon did screw the rifle onto the barrel of the gun at that time, on that occasion, and that this action could have been the source from which a small flek of Sheila's blood got into the silencer. Whiddon has not yet denied that he did it...