My scenario (which matches the body location & bullet allocation) would have only taken Jeremy 10 minutes inside WHF.
He did the crime at the latest 2.30pm as he rang Mugford around 3pm.
Hi Adam

We could spend the next 20 years discussing scenarios, but they are meaningless without proper forensic and factual evidence. You might wish to answer these couple of questions.
1, Were there any witnesses?
2, Did the SOCO's find any fibres or any fingerprints belonging to Jeremy in any of the upstairs rooms?
3, Did the police prove beyond a doubt that Jeremy got into WHF vis a bathroom window and exit through a kitchen window?
4 Was it really proven beyond a doubt the sequence of calls made that night?
5, Was there any proof that the bicycle was used?
6, Was it proven that Jeremy wore a wetsuit?
7, The pathologist found that Sheila had undigested food in her stomach which meant she had eaten 2 to 3 hours prior to her death. Is this fact?
:D :D :D :D