A view of the royal dinning hall.

Rosie Fitzmaurice, The Independent

In an interview with Marie Claire, Darren McGrady — who worked for the British royal family as their private chef between 1982 and 1993 — revealed some of the eating habits of the late Her Majesty the Queen, Prince Philip, the Queen Mother, Prince William and Prince Harry, and the late Princess Diana — and some are pretty bizarre. The royal family behaved completely differently at Balmoral Castle, their holiday home in Scotland, compared to Buckingham Palace, according to McGrady. At Balmoral — where the Queen was often spotted walking her corgis and driving her own Land Rover — the family let their hair down. However, things were a little more stuffy at Buckingham Palace. Still, there were some unspoken rules to abide by and other reports, such as one in Stylist, have backed up some of McGrady’s claims. These are the royal family’s most bizarre and unheard-of dining habits and rules. The Queen Mother was always late for dinner, so they lied about the time: “Dinner was at 8.30 in Balmoral when Her Majesty the Queen Mother was in attendance,” McGrady said. They used to tell her that dinner was at 8.15, and she’d be the last one down. They told everyone else 8.30 because they knew she’d be late.”

Everyone gets their gladrags on for dinner, Downtown Abbey-style: though McGrady noted that Prince Philip was known to sometimes dress so tattily that he once mistook him for the gardener, everyone must change into formal gear 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,” McGrady told Marie Claire. Once the Queen’s done eating, so is everyone else: According to Stylist, once the Queen had finished her last morsel of food, no one was allowed to eat any more.

Philip had zero time for Prince Charles’ organic produce: according to McGrady, he once asked the chef: “Oh, is this a Harrods hamper?”

“I said, ‘No, your highness, this is a hamper the Prince of Wales brought with him.’ He looked puzzled so I opened it up and I said, ‘It’s all organic.’ And he said, ‘Oh, bloody organic!’ And just shook his head and walked out.”

But he loved a family BBQ at Balmoral: “Philip would cook out on the grill,” McGrady said. “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.’”

The Queen used tupperware: that’s right — while Her Majesty has been known to eat off diamond-encrusted or solid gold plates, she also understood the practicality of tupperware. “At Balmoral she’d eat fruit from a plastic yellow tupperware container,” said McGrady.

The young Princes loved McDonald’s: “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.’” Apparently they were particularly keen on the free toy you get in a happy meal. He went on: “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.”

But Princess Diana followed a strict diet of no fats or red meat: McGrady told the magazine: “One day she said to me, ‘Darren I want you to take care of all the fats, and I’ll take care of the carbs at the gym.’” He explained that when Diana was at Buckingham Palace, no one knew about her bulimia. “It wasn’t until she confronted it, and everyone put two and two together, that she started really healthy eating... she liked dishes like stuffed bell peppers and stuffed eggplant — she loved fish.” McGrady used to make her fat-free versions of dishes and she would “trick” the fellow guests into thinking she was eating the same thing.