Here’s a brief article from the April 15 1947 edition of the Toronto Daily Star about a British diplomat who lost his potential posting because of matrimonial difficulties.
Victor Cavendish-Bentinck (1897-1990) eventually became Lord Victor Cavendish-Bentinck, and then became the Duke of Portland when his older brother passed away. Apparently, he normally referred to himself as Bill Bentinck, which is a much shorter handle to go through life with.
Mr. Bentinck was ambassador to Poland from 1945 to 1947; before that, he was the Chairman of the Joint Intelligence Committee during the Second World War. While chairman, he received reports of the annihilation of the Jews but refused to believe them.
As for his alleged matrimonial hijinks: the article above and his Wikipedia page have different viewpoints. The article seems to be a bit anti-Bentinck, whereas the Wikipedia page doesn’t mention his alleged adultery and reports that he found out that his wife and children had left him when his Hungarian maid phoned him and told him. I have no idea which version of the facts is correct.