Stanley usually has one or sometimes two horses in training each year from Hatchfield stud farm, managed by his brother, Peter Stanley. Home to a small number of broodmares, Lord Derby's policy is to sell his colts and race the fillies. The Earl currently owns Ouija Board, winner of seven The Group/Grade 1 races, including The Oaks, Irish Oaks and Breeders' Cup Filly & Mare Turf in 2004, and the last-named race again in 2006. She also won the Prince of Wales's Stakes at Royal Ascot in June 2006. She was third in the Japan Cup following that last win, and was retired after going lame before her intended final start in the Hong Kong Vase at Sha Tin in December 2006. Ouija Board won over three million pounds in prize money. The Earl has published a book about her, "Ouija Board: A Mare in a Million".