I've been sight-seeing the UK with Mr. M.'s family and one of the highlights has been the Banksy exhibition.
Now, I liked what I had seen by him, but what I experienced in Bristol completely blew me away. The sense of humour is sharp and merciless, and sometimes creepy and depressing. I also had the feeling that anyone trying to work on overtly political art will find themselves thinking "Banksy already did that", because there was SO much and SO different to be seen in the show.
I also particularly enjoyed the way the exhibition was organized. It was almost a hide and seek game, watching out between the permanet collection to spot Banksy's hidden pieces.
If you can, go. The hours of waiting were completely worth it.