The Tate Gallery is one of the best art museums in the world. It was about the only thing I managed to see while I was there, and I wasn't disappointed, other than getting run out, and failing to use the one-way glass public toilet outside. Oh, and there's a boat that will take you between the two London branches of the Tate on the Thames, which I also didn't get a chance to use.
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Bitt Faulk