Can I use a discount/promotional voucher to purchase a Merlin's Magical London Pass or Combination Ticket? No, a promotional voucher cannot be used in conjunction with another such as Combination Tickets. Promotional vouchers can only be used against the offer that is stated on the voucher. Buy Tickets Related articles Can I visit all of my chosen attractions in one day? What is included in my ticket? What is a Standard Ticket? What VIP experiences do you have available? Can I purchase a souvenir programme?