yes £45 per adult too
It was so much fun, the night we went was human body themed.
In the evening there was a game of bingo exploring the Wellcome collection, hard to explain but the kids learned a lot. Then was snack time with a snack you brought yourself, followed by a practical demonstration of how the human digestive system works amusingly enough. The kids loved it, I was totally grossed out, but it was really interesting (and I have a science degree so it wasn't pitched very low either. Then we went to a talk on what the blood does, followed by making our own fake wounds.
Then it was bed time, not terribly comfortable, but ok, got a few hours sleep!
In the morning was wake up and pack away, followed by a very nice breakfast provided by them, a much better standard than I was expecting. We then had some time in the hands on area of the museum, just free play but lots of people on hand to answer questions and instigate activites. Finally we saw an imax film looking at things right down on the nano scale, absolutely fascinating.
Sorry for the essay, it was a lot of money, but definitely worth it, and the kids still talk about it frequently 4 months on