I have a Cadbury Free Ticket voucher do I need to pre-book? You will need to pre-book a ticket to guarantee entry, please do so using this link Please bring your pre-booked ticket and your Cadbury pack voucher to gain entry at the turnstiles. Related articles Do I need to pre-book online in advance with my promotional voucher? I have a promotional voucher not listed on the website, do I need to pre-book? Can I contact you via Live Chat? Is my Promotional Voucher valid? I have a Cadbury’s voucher which is due to expire, what do I do?