Re: The argument makes me sick
These jurisdictional arguments are all about angels on the heads of pins.
In the reality that is international law, all nations can ask for extradition of anyone in any other nation to face trial, provided the metalaws associated with extradition treaties etc are satisfied.
Sometimes this becomes absurd - such as when a foreign nation of which I am a citizen criminalized my work teaching encryption and building encryption into software to protect US/European companies from data breach. An extraditable offence for which any citizen of that nation could face ten years imprisonment regardless of where they plied their trade. Happily, they recently updated that particular law to change the citizenship element, but the point is a general one and the UK is no stranger to such calamities in its own laws.