Heseltine, High Treason and Hanging
High Treason was not repealed in Britain until 1998, when Blair's administration fully aware of the treachery upon which they were intent removed its direst penalties, as may be read in Wikipedia, linked here.
Heseltine when he appeared to set about "adhering to the sovereign's enemies," to secure the removal of the Thatcher Government and facilitate Britain's delivery to foreign powers upon the European Continent, was fully aware of the course upon which he had embarked.
Now that the disastrous results of that treachery and those actions can be clearly seen, (as will be briefly debated in Parliament today), with the nation's sovereignty destroyed, its Parliament on the edge of being completely neutered and hence our democracy condemned to irrelevance, should not some power still valid within our land bring this power-crazed man to trial, whether or not the penalty if found guilty must lamentably be less than the ultimate once available.
Heseltine's henchman, still working to promote foreign interests in every nook and cranny of the state, could then perhaps also be challenged and removed.