OK Scip, when I have time (sometime this week), I will post my scenario (although I hate scenario's) - including why I believe Jeremy might be guilty but framed.
Great. I am particularly interested in the basis for each point you think to be the case and noting when there are alternative possibilities because the evidence is ambiguous.
By way of example, Nevill was shot first in the bedroom and then later shot in the kitchen after being severely beaten. He obviously could not have been beaten and killed in the kitchen then shot upstairs later so this proves he was shot first in the bedroom. Plus there was blood on the walls and drips in the rug that indicate his path to the kitchen.
It makes no sense for things to have proceeded to the kitchen unless the gun was empty. Likewise it makes no sense for the struggle to have taken place in the kitchen unless the gun was empty. The killer had to beat Nevill unconscious to be able to reload in peace and be able to finish him off. There were 11 bullets fired in the bedroom at June and Nevill which is the maximum load. With 11 bullets fired the gun would be empty and thus there would be a reason for things to proceed to the kitchen and for there to be a struggle there until Nevill was unconscious, the killer could reload and kill him.
There are 2 possibilities that the evidence doesn't provide any clear answer on. Nevill could have ran to the kitchen with the killer chasing him or Nevill could have chased his killer. Either way in the kitchen they rumbled so it is not an issue of major importance but one must be clear in admitting when the evidence can't provide a clear answer and there are different possibilities.
To aid you keep these things in mind:
1) Vanezis placed the blood in a bottle that he placed seals on so that one can see if they are tampered with.
2) Each bottle was then place in a bag with a seal and exhibit number.
3) Davidson filled out a CID6 form to record the blood and other evidence taken from Vanezis and personally took possession of the blood from Vanezis and brougth it to the evidence fridge at Chelmsford the police station
4) Davidson filled out 3 Holab3 forms to effect transfer of the 3 blood samples to HQ and they were taken by badge 1038.
5) A courier brought the blood samples from HQ to the lab. The lab received the 3 samples and returned a copy of the Holab3 form to Davidson to indicate receipt had occurred.
So the evidence COPL had in it possession was that all 3 samples successfully arrived at the lab.
So all 3 arrived and there was no evidence COLP developed of the lab reporting that any of the seals on these samples had been broken prior to arriving at the lab.
That prompted the investigators to ask Davidson if he knew of anyone else taking any samples besides these 3 or if he took any samples covertly himself while at the morgue which of course he answered no to.
I have not seen any COLP interviews where the lab was asked about what happened to 3 blood samples after being placed in their possession.
Unless one subscribes to the view that Davidson illicitly took blood extra blood while at the morgue the lab personnel would be the only ones in the position to illicitly use Sheila's own blood for invalid purposes.