Greenham Stakes
In 1947, Bull founded the Hollins Stud in Halifax, West Yorkshire using four mares - Lady Electra, Candida, Orienne and Anne of Essex. At the stud, he bred Romulus, winner of the Greenham Stakes, Sussex Stakes, Queen Elizabeth II Stakes and Prix du Moulin and also Eudaemon, winner of the Gimcrack Stakes and Champagne Stakes. Among the horses that won in Bull's own colours of cerise with a white circle were Sostenuto, winner of the Ebor Handicap and Charicles, winner of the Wokingham Handicap. His stud declined through the 1970s and by the 1980s he rarely owned more than one horse at a time.