"is actively pursuing those within its perceived jurisdiction" Last I checked, only Spain had the (very-limited) self-given authority to do that, mostly to chase down genocidal dictators (and since the Hague I think it's inactive)
UK judges already have the ability to judge whether the crime deserves deportation, but the UK-US agreement isn't at all even, and probably skips this. Germany wanted someone, but he hadn't broken a UK law so he didn't go. Personally I hope he is able to take this to some higher court like the Supreme court (formerly house of lords) and take out the uneven bits of the UK-US agreements.
