I suppose I wasn't the only one expecting to see more than just a room for the price of the ticket. The ceiling is really impressive, but that's about it. I really enjoyed observing the ceiling, the audio guide was even too detailed. The room itself was rather empty, aside for some tables (if I'm not mistaken people can dine or have tea there?) and children drawing and doing activities here and there.
I suppose this is worth it for those who buy the London Pass, if you have to buy the ticket, just keep in mind that a ceiling is all you'll get to enjoy.
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