Queen Elizabeth II and any other Royal Heads of State will in future be removable to prevent Kings, Dukes Queens and even Jacks hanging onto power like Queen Elizabeth.
The "Thatcher Syndrome" where crazed obsessives believe themselves to be indispensible (aka Michael Gove) can set in when power becomes opium - like after several years. It is incurable, so the Heads will be taken to Disney World and frozen 2 miles underground with Walt Disney and Howard Hughes.
There will obviously be less blood with removable heads than if they were guillotined like Marie Antoinette was for having a lot of shoes. In keeping with modern times, the E.U. law states that a guillotine can still be employed in a debate where there is adequate proof of a Queen or Duke having too many handbags.