How many british people died during world war 2?

450,900 British people died during WW2. 383,300 were Military deaths and 67,100 were civilian deaths. This was about 0.94% of the British population that was killed during WW2.
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Britain lost about 451,000 people (not inlcuding British colonies). 383,800 were military deaths and 67,100 were civlian deaths.