When on the “choose your Passes” page, all attractions where Under 3s tickets would be required have the option to “add an Under 3s ticket” at the bottom of the page. Please note that Under 3s are not permitted at Bear Grylls Adventure or any of The Dungeons attractions. An Under 3s reservation is not required for Chessington World of Adventures Resort, LEGOLAND Windsor Resort, THORPE PARK Resort, SEA LIFE Manchester or SEA LIFE Blackpool.