NorthSouth has a very good point there, if indeed our intrepid Biggles was out of Medical / Currency and a variety of other ticks in the boxes then that changes things significantly.
Since a portion of the flight took place in English airspace then an offence was committed in England and a case could be brought through the English courts (allowing the CAA to recover all costs).
The evidence from EDI ATC et all and the final outcome of the flight would just be used to strengthen the case further.....
Personally, if he has knowingly flown out of check, medical etc then I hope they make an example of him.