Are there restrictions for using my Merlin Pass at THORPE PARK Resort? For information regarding restrictions, please visit the Merlin Annual Pass website here. Related articles Do I get free parking with my Merlin Pass? How do I purchase Merlin Pass Friends and Family tickets? Where can I find information on Merlin Passes? I am a THORPE PARK Annual Passholder, do I need to pre-book my entry? I’ve already used my pre-book allocation but would like to book for Summer instead, can I cancel?