The outcome of the first trial was dodgy but so is the outcome of the retrial.
Evans comes across as a liar. He says he had sex with her but left straight after because he had started to think about his girlfriend. Yeah right.

Why leave via fire escape?

Why did the retrial involve two men who had previous sexual relations with this girl? I don't see the relevance here.
Why did Evans even go to the hotel in the first place? He knew his mate had pulled so what was his motivation for going there? It has to be to have sex in my view.

All very dubious.