Wikipedia lists 9 1/2 manufacturers of buses currently in use in London: http://en.wikipedia.org/wiki/List_of_bus_types_used_in_London http://en.wikipedia.org/

Wikipedia lists 9 1/2 manufacturers of buses currently in use in London: http://en.wikipedia.org/wiki/List_of_bus_types_used_in_London http://en.wikipedia.org/wiki/List_of_bus_types_used_in_Londo... (Not to dispute your main point though. The buses here seem to last pretty well.)