A foreigner from Country A visits London and is trapped into confessing to having tried to murder a British citizen while in Country B. How, and where, is he dealt with?
Do things change if I throw in a successful murder?
I would prefer him to be tried and eventually hanged in Britan, but I will think of something else if I have to.
Country A is imaginary, (think Ruritania), Country B has yet to be determined.
I've mostly searched Google Books, using strings such as "crimes committed abroad" "crimes committed on land out of England" (the online version of A History of the Criminal Law of England is, infuriating, missing some crucial pages) "crimes committed by foreigners" "crimes committed by aliens", etc. But I don't know how to find cases with this specific combination of factors. I keep finding information related to the US, or to crimes committed at sea.