In 1926, he purchased the Newsells Park Estate, Barkway near Royston, Hertfordshire as a home for his family and established a stud farm there, from which he bred most of his famous racehorses including Alcide who won the 1958 St. Leger Stakes and the 1959 King George VI and Queen Elizabeth Stakes and Parthia, who won the 1959 Epsom Derby.
Among his stables' significant performances were wins in the Epsom Derby (Pinza, Crepello, Hard Ridden, St. Paddy) Epsom Oaks, 1,000 Guineas, 2,000 Guineas, St. Leger Stakes, King George VI and Queen Elizabeth Stakes.
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The partnership also had successes with Alamshar, who won the Irish Derby and the King George VI and Queen Elizabeth Stakes at Ascot; with Azamour, winner of the St. James's Palace Stakes, the Irish Champion Stakes, the Prince of Wales Stakes and the King George VI and Queen Elizabeth Stakes in 2004 and 2005; and with Kastoria, whose 2006 season included a win in the Irish St. Leger.