When making a booking for a Merlin's Magical London Pass or Combination Ticket, you will be asked to select your visit date and time to your first attraction that you want to visit i.e The London Dungeon. Your ticket is then valid for 90 days from this date to visit the other attraction/s.
Once you have made your booking, your email confirmation will include a link to pre-book the other attractions - You will be required to enter your Order Number and Email address used when booking to log in to the Booking Portal.
You have a maximum of 5 opportunities to edit your other attractions visit dates prior to the original date selected.
Book a Merlin's Magical London Pass ticket here
Book a Combination ticket here