King Charles once revealed that he fuels his 55-year-old Aston Martin with two very unusual items. The monarch, 76, was first given the car for his 21st birthday in 1969, and, even though he has had it for 55 years, he still uses it on a regular basis.

As a lifelong advocate for protecting and preserving the environment, the King has often spoken about how we can all reduce our personal impact - even going as far to have his beloved car to run on two unexpected ingredients.

The surprising fact was revealed by His Majesty himself in a conversation with BBC News about environmental problems. During the chat, the King revealed that his car runs on bioethanol made from surplus wine and cheese.