James Doyle's appointment as Khalid Abdullah's jockey will cause ripples in the weighing room Now, though, the octogenarian owner finds himself looking forward to Saturday's card at Sandown Park, eager to monitor the progress of his unbeaten juvenile Kingman, 7-1 favourite for next year's 2,000 Guineas, with his new retained jockey in the saddle. Buick was originally in the frame for Kingman on Saturday, but Doyle's name had been substituted for Buick on the list of confirmed riders by early afternoon on Thursday. Officially, Doyle's contract starts on Sunday, but connections clearly feel it is best long-term for the association to commence a day early. Doyle will also be automatically booked for the Gosden-trained Excess Knowledge, 5-1 joint-favourite for the Ladbrokes St Leger on Sept 14. Buick was aboard when the colt finished second in the Gordon Stakes. Moore, who won a Derby and Arc for Prince Khalid on the Sir Michael Stoute-trained Workforce, has also ridden scores of well-bred horses for the owner. Several years ago, Stoute put his foot down and refused to use Richard Hughes, another Abdullah appointment, on the owner's horses. Lord Grimthorpe, racing manager to the owner, said: "Prince Khalid has been very impressed with James's riding, including, of course, Al Kazeem this season. James will ride all Juddmonte-owned, UK-trained runners, starting with Kingman in the Solario. Doyle's big break in racing was riding Cityscape to win the Dubai Duty Free at Meydan in March 2012, wearing the famous Abdullah silks. But he has continued to attract attention and rode a treble at Royal Ascot in June.