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 operation to recover the unexploded bomb near the Houses of Parliament let to disruption in central London overnight.
Southern parts of England and Wales will see sunny skies after a frosty start.
A police spokesman said the incident in the Bourke Street Mall on Friday was not related to terrorism.