When it comes to travelling abroad, a number of important rules exist to protect the King and other members of his family when they fly overseas - some of which are truly surprising. Whether it is bringing their own alcoholic drinks for fears of being poisoned or always packing a black dress in case they are required to return quickly because of a death, all the rules are in place for a reason. There is another important royal custom has been bought in to protect the future of the monarchy as it places restrictions on who can travel together in the same plane.

At present, Prince William is allowed to fly with his three young children as they are small, but this will change in the years to come. Speaking on HELLO Magazine's 'A Right Royal Podcast', King Charles' former pilot, Graham Laurie, opened up about the rule and how it affected a young Prince William when he turned 12 in 1994. He told the hosts: "Interestingly, we flew all four: the Prince, the Princess, Prince William and Prince Harry , up until Prince William was 12 years old.

After that, he had to have a separate aircraft and we could only fly all four together when they were young with the written permission of Her Majesty. When William became 12, he would fly normally in a 125 from Northolt and we would fly the 146 out with the other three on." In the next two years, Prince George , 10, will also be affected by this rule and he will be expected to fly separately from his father.

It remains to be seen if George will.