Can I use my voucher in-conjunction with a combination ticket? Vouchers cannot be used in-conjunction with any other offer, this is including a combination ticket. Related articles I have booked my tickets online, but not received an e-mail confirmation? Do I have to visit both attractions in one day? Am I entitled to a free carer ticket? How long do I have to use my combination ticket? Why do I need to book a time slot with my combination ticket?