You are only tried and tested by the rules and laws of the country that you are arrested in, unless your home country has requested it by which you will be extradited for trial.
If they are found guilty, then there will be other rules and terms and conditions to worry about. I know in my company should I do anything such as this and get the media attention, then I would be sacked for bringing the company into disrepute, they wouldn't even get to contravening the rules of exercising my license.
Look at it from a different angle, if a UK based pilot was caught at Glasgow who was about to fly to another country (say Canada), the next time they go to Canada, should they be arrested and tried there too?