I have a voucher, how do I use this? Head to our Discounts, Voucher and Promotions page here for information on all current discounts and promotional vouchers. Related articles How do I redeem my voucher or discount? How do I redeem my McDonald's Happy Meal voucher? How do I redeem my Kellogg's cereal voucher? Is my voucher valid? How do I redeem my Cadbury's Share Bag voucher?