Are there restrictions for using a Merlin Pass at The London Dungeon? For information regarding restrictions, please visit https://www.merlinannualpass.co.uk/ Related articles How can I purchase Merlin Pass Friends & Family Tickets for The London Dungeon? Do I need to pre-book entry with my Merlin Pass? Is the attraction suitable for children? How do I contact you with a guest enquiry? I thought the summer pre-book tickets were being released in May, why are they being released now?