The Queen was reported to police for not wearing a seatbelt as she travelled to the State Opening of Parliament in her official call. 

West Yorkshire Police said they received a 999 call about the royal journey.

But the force said the caller also thought it was a good idea to ring their local police force, as the Queen was travelled with Prince Charles through London from Buckingham Palace to Westminster. 

http://www.independent.co.uk/news/uk/home-news/queen-police-reported-seatbelt-car-west-yorkshire-state-opening-parliament-a7803846.html