We don’t actually know if he did any of that. There was never a trial. For all we know, they were looking for their guy and he never showed. Then this posh British guy came in to get some coffee and they started chatting him up. Him, not knowing what is going on, decides “what the hell, I’ll play along with the prank” (note, he never said, in person, he was going to have sex with her). Turns out it wasn’t a prank at all, but they thought they found their guy and bam, he goes to jail.
I’d be curious to hear the Duncan Donuts recording. I think that would be the deciding factor for me.