I'd certainly use the Big Bus tour again. We took the Blue bus ...the only problem was you had to change buses from one route to another in order to go back to your departure point which in our case was Paddington. The leaflet didn't make this clear..and it was only because we heard it on the earphones that we managed to make the appropriate change. The commentary was informative and quite good though not fully up to date as it didn't mention the Shard building even though we were opposite it! An excellent way to see most things in a day.
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