Try the Chichester Planetarium. I went to see one of the many public shows and it was fantastic, with a live commentary from Dr John Mason. It was about the many moons in the solar system and the possibilities of life there. The kids loved the stardome projection and all the videos. (make sure they're over about 6yrs tho').
Date: Wednesday, June 27, 2012
Repeats: Every Week until Monday, December 31, 2012