Are there restrictions for using my Merlin Pass at Warwick Castle? For information on your Merlin annual pass restriction dates, please click here to view our restrictions calendar. Related articles Do I need to pre-book entry to Warwick Castle if I am a Merlin Pass Holder? What is included in my Ticket? Is Car Parking included in a Warwick Castle Annual Pass? Where can I find information on Merlin Passes? Do you have Water Fountains available?