That's a good way of putting it, because in a recent manslaughter case the US citizen (driving on the wrong side of the road) flew home on diplomatic immunity (a familial extension, not even the diplomat herself) and the US has refused extradition.
I think the immunity was eventually deemed not to apply (or at least to be questionable) but even if not there was precedent of a Briton's immunity being waived for extradition to America; a favour not repaid in this case.
I think the immunity was eventually deemed not to apply (or at least to be questionable) but even if not there was precedent of a Briton's immunity being waived for extradition to America; a favour not repaid in this case.
So yes, 'political power' indeed.