I guess we all look at things differently Steve, without the dna evidence to me it is a 100% clear moj no doubt whatsoever, what the cops got up to was extremely poor to say the least. What I find very strange is why only one dna profile was found on the samples?
The exhibits were all lugged around together contamination cannot be ruled out. Valerie originally picked out a totally innocent man and only picked out Hanratty after he was asked to speak several phrases which at that time in London would be quite common.
But she didn't pick out Alphon either. The crime to me has all the hallmarks of someone not in control of his faculties, no plan, unsure of how to proceed, having to pause during the commission of the crime, someone of very low intelligence. I think Gregsten sensed this when he made the movement with the bag, possibly in an attempt to grab the weapon.
Alphon was a completely different character: cocky, over-confident, garrulous. I just don't see him dithering during the execution of the crime, neither do I see him dumping the murder weapon under the backseat of a double-decker bus, a location Hanratty had told Charles "Dixie" France would be a good place to hide incriminating objects.