Question: are london buses in zones?
Answer: Buses do not operate in zones and any Travelcard is valid for any bus journey within Greater London regardless of the zone(s) it covers. If your Travelcard includes Zone 3, 4, 5 or 6 you can use it on trams. You can use a Visitor Oyster card in any zones, but your fare will vary depending on which zones you travel in.