465 Kingston to Dorking. This one goes way outside London - past Chessington World Of Adventures, through the small town of Leatherhead and past the foot of Box Hill to the lovely Surrey town of Dorking. It seems very odd to find a red bus here. Every 30 mins Mon-Sat, 60 on Sunday.

Timetable can be found here http://www.londonbusroutes.net/times/465.htm