We really enjoyed our 2 day pass with Big Bus tours. Only complaints are that on day one, we only got on the bus at Marble Arch and had to change buses at Baker Street. On day 2 we got the bus to Trafalgar Sqaure and went walkabout. We walked the length of South Bank with the intention of getting the boat back to Westminster Bridge from the Tower - only to find out that they couldn't sail until later in the afternoon because of high tide. This messed up our plans as we had timed it to get back to Westminster Bridge and then the Big Bus up to our hotel at Marble Arch in time to pick up our cases and head to the airport. We had to get the Big Bus back to Embankment station (and had to wait about 25-30 minutes for the bus) and then we had to use the underground, which we had no intention of using, to get back to the hotel.
Other than these 2 points, I would recommend it and would advise the live commentary over the recorded guide.
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