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 I used Tesco Clubcard to purchase my Merlin Annual Pass, what type of pass does this entitle me to? How do I book a date to use my complimentary tickets? Do you offer an Open Dated ticket? Can I upgrade my day ticket to a Merlin Annual Pass? Where do I collect my Merlin Annual Pass from?