P312 4-Tel 312 Sat 10 Dec C4 22:21:01    DON'T FORGET YOUR TOOTHBRUSH   Tonight, 21.00-22.05 PREVIEW Chris Evans hosts another Saturday night melange of music, mayhem and madcap competitions. Every week, 300 people from around the country arrive at the Toothbrush studios, packed and ready to win a fantasy holiday beginning that night. Tonight's special guest is Kylie Minogue, accompanied by resident ivory-tickler Jools Holland. NICAM stereo Repeated Sunday 18.00 Rory Bremner...Who Else? 313