Can I use my 2 for 1 online and use it against the online price? 2 for 1 vouchers cannot be used in conjunction with any other offers or promotions including the online discounted rate. For information on how to redeem your voucher, please visit here. Related articles How do I redeem my Kellogg's voucher to purchase an online ticket? How do I pre-book entry for a promotional voucher? Do you offer a student discount? Why do I need to book online? Can I use Tesco Clubcard for entry?