P403ORACLE 403 Mon10 Feb C4 1711:21       Channel 4 Racing, 1.15-3.20pm Brough Scott introduces the day's racing from Sandown. Today's big race is the Gainsborough Chase at 2.30pm. With the best steeplechasers in the country preparing for the Gold Cup it's bound to provide vital clues. Derek Thompson interviews the key personalities and the commentators are John Oaksey and Graham Goode. More on page 449.  4 Sports Fans 449 