This plan, however, please do covers central London, Greenwich is not nor Camden, but ...
Bus lines are numbered, and are reported in terms of white round at major intersections, a little disconcerting at first, but you're not stupid, you will like me: after locating where you want to go and where you go, you will draw the lines that interest you stabilo felt on the plane and it's good!
The back underground map is also useful, it finally you have it on all levels, but the lines terminals are not included, embarrassing to choose the direction of the line, but you have good indicative tables locally .