How do I book a time slot with my Merlin Annual Pass? Yes - All guests, including Merlin Passholders, must pre-book online in advance. To book, please visit here. Related articles Where do I go to gain entry with my Merlin Pass? Why do I need to book a time slot with my combination ticket? How do I purchase friends and family tickets for SEA Life Manchester? Does SEA LIFE Manchester have a car park? Am I entitled to a free carer ticket?