Can I upgrade my Chessington World of Adventures Annual Pass to a Merlin Annual Pass? Yes! Upgrade your Chessington Annual Pass to a Merlin Annual Pass to experience AWESOME at 32 incredible attractions! For more information, please visit here. Related articles Do you offer a Parent Swap Pass? Can I contact you via Live Chat? Can I buy a pass that isn't assigned to a person but is assigned to a company? How can I contact you? Do you offer reduced rates on Annual Passes for guests with disabilities and their carers?