Data sources used:

https://en.m.wikipedia.org/wiki/List_of_prime_ministers_of_the_United_Kingdomhttps://en.m.wikipedia.org/wiki/List_of_prime_ministers_of_the_United_Kingdom_by_length_of_tenurehttps://en.wikipedia.org/wiki/Winston_Churchill https://en.wikipedia.org/wiki/Arthur_Wellesley,_1st_Duke_of_Wellington https://en.wikipedia.org/wiki/William_Ewart_Gladstone https://en.wikipedia.org/wiki/George_Canning https://en.wikipedia.org/wiki/Margaret_Thatcher

Visualisation Tool: Canva, Annotations done on Goodnotes

And testimony to our meritocratic system is that only 20 of the 57 went to Eton school, and a mere 44 went to Oxford or Cambridge! God I love our democracy...

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Elite at their best to abuse the system

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it shouldn't be surprising that the people who end up in the most powerful positions in society by and large had the best educational opportunities historically (Eton + Oxbridge) or more recently are self selected from people who were high academic achievers (Oxbridge grads).

Nothing to do with centuries of the old boys network then?