Whilst obviously bowing to the professional skills of prOOne, see his profile I did a law course in the 70s/80s and there were, I think, 5 cases where the death penalty could be awarded for treason. Two of them which spring to mind were (1) Arson in the Royal Dockyard and (2) Violating the sovereign's oldest daughter - unmarried. Could be the basis for another Blunkett initiative here as I don't think he has announced one for around 36 hours.