Well the only thing we have is Brainwashing Jones at the moment. Which I am skeptical about.
And I'm scepital about the scorned woman theory. They appear to have parted on good terms eg with him helping her move and dropping her off in the West End for a night out on the town with LR. She had her own life to lead, finishing her ed and a career to pursue, she wasn't dependant on JB for anything. They were only known to one another for some 18 months. Their lives were not intertwined by way of marriage, children, property etc so easy to make a clean break and move on.
And the scorned woman theory doesn't explain how other witnesses got on board but DS Jones using the drugs angle does. You claim to be an ex-con so you will surely have some understanding of how the police fit up suspects particularly pre PACE when they pretty much had carte blanche.
I am looking forward to re-reading JM's trial testimony. Thanks.