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 What is included in my ticket? What is a Standard Ticket? Can I visit all of my chosen attractions in one day? How can I contact you with a guest enquiry? Do you offer a senior rate?