246 Bromley to Westerham. A nice ride out into the country to the small town of Westerham with its Wolfe of Quebec and Winston Churchill associations. On Sundays buses continue to Chartwell, Churchill's old home, which is open to visitors. Buses every 30 mins Mon-Sat and 60 on Sunday.

Timetables here http://www.londonbusroutes.net/times/246Sum.htm