[jumpy]

I don't see any fantasies here myself.
And it's no surprise that no comment is forthcoming from us sources; I wouldn't want to publicly discuss some shady, outdated excuse for violating a sovereign nations boarders and abducting foreign nationals either. In essence that is what is being raised here. That the law further helps itself by discounting appeal and pursuing a conviction despite an illegal arrest.
All very convenient if the motivation is there to utilise it.

I don't doubt for a second that the UK would not take advantage of such a loophole if we thought it was to our benefit and that hardly anyone would get to find out about it.
Doesn't make it right though.
When it comes right down to it, it's an insult to any allied nation that an administration is prepared to deal with the citizens or residents of a foreign power in such an underhanded manner.
Alliances, even supposedly close partnerships like the UK/US can be shown as meaningless and 'fair-weather friendships' with such actions. I can't see how one could construe it any other way.