In the world's greatest chocolate factories, the series discovers how our favourite bars and boxes are made, including Kit-Kat, Toblerone, Cadbury and Lindt. The series also reveals the remarkable hidden histories of the most iconic bars and along the way enter the world's biggest chocolate shop, unwrap the world's most expensive bar, see the Queen's favourite chocs and relive chocolate's greatest movie, Willy Wonka and the Chocolate Factory.