That depends on how plucky the UK is feeling politically. There may be times when the UK feels like reminding the US who it was that actually invented Common L

That depends on how plucky the UK is feeling politically. There may be times when the UK feels like reminding the US who it was that actually invented Common Law jurisprudence. And then there may be times when all the Anglophone Commonwealth-allied nations (US GB CA AU NZ) want to prove the strength of their mutual friendship before the observers in the gallery. Assange was holed up in Ecuador-in-London long enough for politics in both countries to change, but he may have had unreasonable expectations to begin with. Snowden may not have been expecting to get stuck in Russia, either, but there he was, because every route between there and the place he claimed was his intended destination was so very willing to turn him over, via an expedited process. At least the UK does the entire extradition hearing process. Even if the result is arriving at a predetermined conclusion via plausible rationale, there is some opportunity there, that one does not have if you enter US custody the instant the plane hits the taxiway.