Well, he was not re-elected in July 1945, so he had no more say in the policies of Westminster- at least not until his reelection in 1951.
Anticipating this possible electoral result, he already brought his successor Attlee to the Potsdam conference.
No offence meant to him personally. Afer all, he was admirably - for the most part - able to separate his country’s interests from his personal opinions.