Brabazon, Aubrey - one of two jockeys I'm aware of who has won a race at the Cheltenham Festival and ridden a Classic winner in the same year.
Brabazon achieved this twice, firstly with Cottage Rake (Gold Cup) and Masaka (Irish Oaks) in 1948 and secondly with Cottage Rake (Gold Cup) Hattons Grace (Champion Hurdle) and Mighty Ocean (Irish 2,000 Guineas) in 1950.