I have a Cadbury 2 for 1 voucher, how do I book? To book using your Cadbury 2 for 1 voucher, please head to: www.funcountdown.com/cadbury Answers to frequently asked questions about this promotion can be found here. Terms & Conditions are available here. Related articles I have a Kellogg's 2 for 1 voucher, how do I book? Do you offer any discount for the Armed Forces and NHS? I have a 2 for 1 voucher from Capri-Sun, how do I book? How do I redeem my Tesco Clubcard Points? How do I redeem my voucher or discount?