Perhaps he didn't know that? Remember that he died just before the trial. Maybe he would have testified in Bamber's favour, who knows? I personally would like to hear more from Bill before I too am convinced of his scenario.
Grahame, I like your ability to step back from the fray; a cool head. In relation to Taff Jones, I knew him and it is distinctly possible he would have testified in Jeremy's favour. In fact, I would have bet that he would have done.
I don't know for sure what ACC Simpson's motives may have been; he was clearly placed under a lot of pressure. But let me offer one thought. I don't think that Essex Police actually wanted Jeremy Bamber convicted at the trial. I think they put up a weak case with a very dodgy chief witness who they probably thought the Jury would not believe. They offered no evidence in relation to four of the murders. Most people thought Jeremy would be acquitted.
Maybe the best possible outcome politically for ACC Simpson and EP was for Jeremy to be acquitted. They could then have said to the relatives, "Look, we did our best but the evidence did not persuade the Jury. Sorry, but there is nothing more we can do". The relatives would have grumbled and moaned, Jeremy would have walked free, his reputation tarnished and lingering doubts would have existed about his innocence. He would have been hounded by the gutter press. His life would have been miserable.
Instead EP got the worst possible scenario. A young man who protested his innocence and doubts were voiced about the safety of his conviction straight away. A man who continues to protest his innocence and by doing so has caused EP to become embroiled in on-going controversy and if I may say so, become involved in creating ever more desperate-looking and highly implausible explanations about some of the emerging evidence. i.e. "Police in conversation with someone from inside the Farm" "Oh that was a reference to Jeremy Bamber" - who do they think buys that?
So, in my view this was not some clever and devious widespread conspiracy. This was policy being made on the hoof; pretty much always reactive in nature. They tripped themselves up with the evidence.
And, I bet EP still regret the fact that Jeremy was found guilty.
Anyway, just a thought.