Prince William and Harry were fans of McDonald's.

Prince William and Prince Harry

Prince William and Prince Harry

The royal princes loved eating "all sorts of American foods", according to former royal chef Darren McGrady, when they were growing up and would particularly like visits to the fast food chain so they could have the toy in the kids meals.

Darren said: "I remember the Princess came into the kitchen one day and said, 'Cancel lunch for the boys I'm taking them out, we're going to McDonald's. And I said, 'Oh my god your royal highness, I can do that, I can do burgers.'

"And she said, 'No, it's the toy they want.' Yeah, the boys loved McDonald's, and going out to pizza, and having potato skins - sort of the American foods. They were royal princes but had children's palates."

The royal family have very formal meals together and like to dress up for their dinner.

He added: "They would come in for afternoon tea by the log fire in outdoor clothes, and then they'd all change for dinner. They'd come down in dressy ball gowns, and sit at the table - like a 'Downton Abbey' dinner. All the fine china was brought out. At the end of the meal, a bagpipe player would walk around the table."

And Darren has revealed that the family really like to "let their hair down" when they are at Balmoral.

He told "Balmoral is where the royal family really let their hair down. They relax and have fun. You see them all the time. At Buckingham Palace, the Queen was too busy and the kitchens too far from her apartment - so we never saw her.

"At Balmoral, we'd see her all the time. They were much more relaxed and had more free time. Philip would cook out on the grill. He'd come down to the kitchens and discuss what food we'd have: 'Do we have any salmon that any of the family have caught? The queen's been picking strawberries with Princess Margaret, let's have those for dinner.'"