Chocolate that beats heat of the desert

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But for British troops struggling in Iraq's fierce temperatures, it could be a godsend.

The milk chocolate in their basic ration packs soon melts in the desert heat of 40c or more.

But Australian scientists are developing a recipe for bars which remain firm at temperatures as high as 49c.

The chocolate will be distributed to their soldiers within a few months - and the recipe will be passed on to British troops.

Dr Lan Bui, of Australia's defence science and technology organisation, said: "You can chew on it and break it down and the taste experience is excellent."

The secret to the nonmelting chocolate is using fats that have a higher melting point.

Tony Bilsborough of Cadbury - whose chocolate melts at less than 37c body temperature - said the invention would not be popular outside the Army.

"The whole point about our chocolate is that it has to melt in the mouth as part of the complete taste experience," he added.