@Aodhhan
"When this is the case, the court where HARM WAS DONE (ie the US) has jurisdiction."
If it isn't a crime to do it in the UK (to a computer in the US or anywhere else), then you have no jurisdiction, (despite thinking that your laws somehow apply to the entire world) because there's no offence.
If it IS a crime in the UK, then he should be tried in the UK.
Don't delude yourself that this is about justice. Make no mistake, this is about the US Department of Defense getting vengeance for being made to look like the incompetent fools that they are. Do you work for them? It certainly sounds like it.