In fact in PS Adams statements mentioned above he makes specific reference to the fact that what was mistakenly thought to be a female body turned out to be that of Ralph.
Can't be much clearer. 
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Except that at a de-briefing PS Adams and the other armed police officers were told by senior officers that they all had to write up their notes, and make their statements along the lines that what they had been dealing with was four murders and a suicide, and that they had to refer to the position of the bodies as shown in the SOC video clip, and photographs...
PS Adams told COLP (1991) that he was not happy with the position of Sheila's body as shown in the video taken at the scene, but he was told by senior officers to toe the line, along with everyone else...
So, if true, where does that leave PS Adams account about the female body and the male body?
In any event, if this was merely a mistake where the body of a male victim was inadvertently identified as the body of a dead female, how come that according to the contents of the police radio message log, there was only another three bodies found upstairs by 8:10am?
Additionally, how come by 7:45am, DS Davidson (SOC) was being contacted at his home and told to come into the office because police at the scene (WHF) were dealing with a murder and a suicide?
If there was only one body - how could the police at the scene at that time, be dealing with a murder, and a suicide?
The known facts do not fit the explanation you are referring to and relying upon, since, if it was merely a case of a mix up, where the body of a dead male was mistakenly identified as a dead female, police at the scene would not be reporting a murder and a suicide, and what is more, four bodies would have been found upstairs, not three, by 8:10am...