They said on the documentary (it was channel 4) that he hasn't been approached for questioning by any of the 3 police forces (British, Portuguese and German). Whether that's true or not - I don't know.
He probably realises that he's safer in prison than out?
I don't get how they can name him, show his picture, virtually say they are 99% certain, but go no further.
I know I'm not very clued up on the law about this, but it baffles me.