Are there any restriction dates for using my Merlin Pass at SEA LIFE Birmingham? For information regarding restrictions, please visit https://www.merlinannualpass.co.uk/ Related articles I'm a Merlin Pass holder, do I need to pre-book? Where can I find information on Merlin Passes? How do I purchase Merlin Pass Friends and Family Tickets? I thought the summer pre-book tickets were being released in May, why are they being released now? Can I purchase tickets on the day?