You can pre-book your entry with a Merlin Pass by visiting the SEA LIFE London Aquarium website here.
Please note, to reserve your ticket for your desired date and time there is a £1 reservation fee payable at the time of booking. Reservation bookings must be made 24 hours in advance.
During peak periods ALL Merlin Pass holders need to also book into a time slot. This can be done in two ways: by either using the link above to pre-book a time slot for £1 before your visit or for free by collecting a time slot on the day (subjet to availability)
If you choose to pick up your time slot on the day, please be advised that you will have to queue for up to 1 hour at peak times and that the next available time slot could be an hour or more past your desired time. We, therefore, recommend that you pre-book online.’