Obama has the Beast, but William and Kate have the altogether more regal sounding Flying Spur – a new, £250,000 armored Bentley to keep them safe.

As well as a top speed of 200mph, a luxurious walnut interior with wi-fi internet, the new motor also has triple glazed, bullet-proof windows with 1.5inch glass, hardened steel armour and tyres that don't deflate even when punctured.

A Kensington Palace spokesman told the Daily Mail: “The Bentley is being leased by the Duke and the Duchess of Cambridge and Prince Harry for official engagements, which is no different to any other member of the Royal family.”