There are 2 routes, the blue route and the red route. The blue route is longer and we only took the blue route bus once - after that we hopped on and off the red route bus constantly to see all the sights. If you get a 48 hour bus ticket you get a free river trip to Greenwich from Tower Bridge as well as a separate trip from Tower Bridge to Westminster Bridge.
The blue route bus has a taped commentary (with earphones) and the red route bus has live commentary with information about the sights en route. The live commentary varies according to who you get - some are loud and lively, some quieter but still very informative.
A fantastic way to see London. I thoroughly recommend it.
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