Note that in Box No.35, at reference 35/4 is mentioned a 'VIDEO TAPE OF SCENE' with 'EXHIBIT LABEL' copy of 504...
The exhibit label would bear the signature of the person's who took the video footage, non other than either DC Oakey (Headquarters SOCO), or DC Henderson (Headquarters SOCO), prior to PC Bird (2nd SOCO team), and Co' taking control of the crime scene afterwards, once police had staged Sheila Caffell's body on the bedroom floor...