They might taste scrumdiddlyumptious, but new Willy Wonka chocolate bars pack more calories than almost any other brand.

It has been a fantastic challenge because Willy Wonka has an amazing reputation for delivering deliciously, amazingly imaginative scrumdiddlyumptious products.

Tam Fry, of the National Obesity Forum, described the calorie count as "unbelievable" and said the use of words such as "scrumdiddlyumptious" was clearly aimed at children.

Nestle hopes to capitalise on the continuing popularity of Roald Dahl's Charlie and the Chocolate Factory with three flavours of Wonka bar, even borrowing the author's vocabulary to call it "scrumdiddlyumptious."