Final answer:
David Lloyd George was the British Prime Minister who signed the Treaty of Versailles during the war.
Explanation:
The British Prime Minister during the war who signed the Treaty of Versailles was David Lloyd George. He, along with President Woodrow Wilson, French Premier Georges Clemenceau, and Italian Prime Minister Vittorio Orlando, were part of the Big Four who negotiated and signed the peace treaty that formally ended World War I.
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