Cadbury brings back Merlin Entertainment on-pack promotion Print Cadbury is bringing back its on-pack promotion in partnership with Merlin Entertainment. The promotion is running for six months and offers shoppers the chance to win a free ticket to a range of UK attractions, including Alton Towers Resort, Chessington World of Adventures Resort, Thorpe Park Resort and the Legoland Windsor Resort. It is running across selected Cadbury Chocolate and Biscuits lines, as well as Cadbury’s seasonal range once it becomes available, supported by a campaign running between July and August The on-pack promotion will be supported with a high-impact campaign between July and August across social and digital advertising as well as plenty of in-store marketing to make the partnership unmissable.