To be honest, Me being a Vampire Nerd! , I have never been stopped on Vampire from boarding due to heavy rain. Usually, a staff announcement usually says about the weather and your choice to ride yet so others let you go in front if you dont mind getting wet. (This has happened to me before). But usually, all weather, I am boarding Vampire! Another ride that has not been mensioned is Rodger the Dodgers Dodgems. If there is heavy rain then the Dodgems does temporally stop operating. Chessington & Zoo is good because most rides apart from usually Dragon's Fury and Rodger the Dodgers Dodgems are usually open in all weather! :DOh, and what Paul said about Dragon's Fury being closed during poor weather. That is definately 100% true unfortunately! (Angry face as Dragon's Fury is fun in the rain!)