More and more I'm getting the impression that you couldn't care less about Jeremy's guilt. The prisoner could actually be anyone because it doesn't seem to be about their guilt/innocence. It gets dismissed as being an "entirely different matter" It's about getting at the police.
No, I'm advocating we deal with it (for now) as distinct issues. Or, if you really wanted to, you could connect them by turning the matter on its head...
If Jeremy Bamber is responsible for the killngs, why did the police need to attempt re-write the incident log?