Lauren Booth is a well-connected woman, as her sister Cherie is married to Tony Blair. In the premiership of her brother-in-law she visited Downing Street and on the strength of her social standing now and again had an article published in the press. Hatred of Israel is her topic and so she is a standing embarrassment to Tony Blair as he tries to create a Middle East peace process.

Lately she sailed with the Islamist flotilla to Gaza. Now she has taken part in a demonstration in central London. Listen to the report of her words: “We say here today to you, Israel, we see your crimes and we loathe your crimes. And to us your nation does not exist, because it is a criminal injustice against humanity.” She finished by appealing to Lebanon, Jordan, and Egypt to invade Jerusalem. And just to make sure we get the point, a man and a boy are shown in a photograph standing by the speakers’ platform with placards that read, “For World Peace Israel Must Be Destroyed” and“Israel Your Days Are Numbered.” This is a call for mass-murder.

For Lauren Booth, Jews are all criminal, a nation that deserves to be killed. It is pointless to wonder whether she has had an experience of Jews, and equally pointless to wonder if she has any idea what her desired genocide would look like in practice — Jerusalem burning, piles of corpses, many of them Palestinian as the Jews go down fighting.

We have been here before. Lauren Booth startlingly resembles Unity Mitford, the Nazi whose biography I once wrote. She too was well-connected and could get the occasional anti-Jewish article into print. She attended demonstrations. At one of them, in Germany in 1935, she took the microphone to express solidarity with Germany and the struggle against the Jews. Jews, she thought, posed a danger to all the peoples of the world and the world would have to be rid of them. Her sentiments and her wording are absolutely interchangeable with those of Lauren Booth, and vice versa.

Lauren Booth and Unity Mitford are a pair of dizzy females, mere social oddities of no real interest, but in a context where the political process has broken down, their fanaticism becomes a danger to other people.