Can I purchase a Merlin Annual Pass from Shrek's Adventure? Of course! Once you have decided which pass to go for, click here to purchase your passes. You can collect your Merlin Annual Passes from the Box Office on arrival. Related articles Are there restrictions for using a Standard or Premium Merlin Annual Pass at Shrek's Adventure? Do you offer a Merlin Annual Pass where you can pay in monthly instalments? Can I book my date/time slot for my other attraction/s for my Merlin's Magical London Pass? What is Shrek's Adventure! London?