You would do well to remember the timing of these (07:45am) events, since by that stage (7:37am) two bodies had already been found upon entry to the kitchen, one dead male, one dead female, a murder and a suicide, and by 8:10am, a further three bodies found upstairs...
What would the police do, if the operation went pearshaped at just after 8:10am?
If Sheila's body vanished from its original position of being found in the kitchen upon entry (7:37am), by 8:15am, and by 8:30am, she was upstairs in the bedroom, and by 9:30am, she had been shot under the chin as a result of a training exercise which went dramatically wrong, thereby delaying SOCO taking control of the scene until 10 O'clock, and a decision taken to write out of the operation the fact that Sheila's body had ever been present in the kitchen, and that the details of the entry into the premises had to be altered to take this decision into account, and re-write the script so that it reads that only one body had been found upon entry, Ralph Bamber, with the other four bodies, June, Sheila, Daniel and Nicholas, found upstairs, you would do the following:-