Made a new topic for this because it's slightly different from David's.
I have a theory about Sheila's hands and why it was 'later' reported that they were clean. We know that Venezis's contradicts himself with his written notes and his final report (blood stained hands/ not blood stained). I 'think' EP forgot to photograph Sheila's palms and realised that questions would be asked. Venezis was at the meeting with SJ et al when they discussed who they thought was responsible, (Sheila or Jeremy). He now suggests that the stain on her nightdress looks like fingermarks and that the comment about clean hands was made 'after' she was washed.