Catherine has slowly returned to public events after cancer treatment and had been expected in the procession of Royal Ascot, but she abruptly canceled.

As for which member of the Royal Family is an expert at picking winners, Harrold noted, "Queen Camilla is very much into horses. The King is, but I would say Camilla is more so, along with Princess Anne. If you're going to be taking advice on which horses, I would look at Camilla for a good tip."

Princess Kate has missed an expected appearance at Royal Ascot, with Prince William attending the event without her.