Prime Minister David Cameron will present the first Arctic Star medals and Bomber Command Clasps at Downing Street today.
Up to 250,000 veterans, and the families of those who died, are eligible to receive the new awards.
It comes after David Cameron's announcement in December that he was accepting the recommendations of a review of military decorations.
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The best of the weather will be in central and south-eastern parts of the UK, with persistent rain in the north.