I was thinking that there should be a route for old Routemasters in London (the originals, not the Boris Routemasters which only loosely resemble the originals) - I know they're not disabled accessible, so I think there should be a heritage route. This, like a heritage railway, can be charged at higher than normal prices and need not be included on travelcards/oyster, etc. I.e. they're intended for people who want to ride an old routemaster "for the sake of it" (although it should connect tourist hotspots so people can use it to get to places).