I have a Carex 50% off promotional voucher, how do I pre-book? You will need to pre-book a ticket to guarantee entry, please do so by clicking here. Please bring your pre-booked ticket and your Carex voucher to gain entry at our turnstiles. Related articles I have a Cadbury's 2 for 1 voucher, how do I pre-book? I have a Kellogg's promotional voucher, how do I pre-book? Do I need to pre-book online if I have a promotional voucher? Is my promotional voucher valid? Do you have Blue Badge Parking?