Are there restrictions for using a Merlin Pass at SEA LIFE London Aquarium? For information regarding restrictions, please visit https://www.merlinannualpass.co.uk/ Related articles Do I need to pre-book entry with my Merlin Pass? How do I purchase Friends and Family Tickets for SEA LIFE London Aquarium? I’ve already used my pre-book allocation but would like to book for Summer instead, can I cancel? Under 3s go free – how to book Where can I find information on Merlin Passes?