Do I need to pre-book entry with my Merlin Pass? Yes - All Merlin Pass holders must pre-book entry. For further information, please visit here. Related articles Are there restrictions for using a Standard or Premium Merlin Annual Pass at The London Dungeon? How can I purchase MAP Friends & Family Tickets for The London Dungeon? What if I'm running late for my time slot? How do I book with my VIP Merlin Annual Pass? How do I contact your Customer Services team?