sentences:  Duffield was a journeyman jockey for a great part of his career, but he became much better known in 1992 thanks to the exploits of the three-year-old filly User Friendly, trained by Clive Brittain, also at Newmarket, User Friendly gave Duffield his first 'Classic' success when winning The Oaks, she followed up by winning the Irish Oaks, Yorkshire Oaks and St. Leger Stakes, before going down by a neck to Subotica in the Prix de l'Arc de Triomphe at Hippodrome de Longchamp.Other big race victories included back to back Champion Stakes wins on the Prescott trained Alborada in 1998 and 1999, as well as landing major gambles on the Prescott trained handicapper Pasternak in the 1997 John Smith's Magnet Cup and Cambridgeshire Handicap.George was also used by Aidan O'Brien, and had two Group 1 victories for the Ballydoyle stable, when winning the 1999 Racing Post Trophy on Aristotle and the 2000 Eclipse Stakes on Giant's Causeway.