We have a problem here in America that I was recently discussing as the problem of the cursus honorum. All our leadership thinks alike, because nearly all of them went to Ivy League schools, then Ivy League grad schools, Ivy League law, then Wall Street or a ladder in government.
It's even worse in Britain. As the Guardian points out, the UK's government is almost wholly led by people who graduated from one university, Oxford, with exactly the same degree: Philosophy, Politics, and Economics (PPE).
These schools, including Oxford, are not necessarily bad schools. They may well deserve much of the accolades and respect that attaches to them. But they produce tokens of a type, and that type has its own biases, and places where its mind is closed.
Of course, that view is the very reason that "diversity" arguments are floated at these very institutions: the idea is that more people from different backgrounds should undergo exactly the same education. What is needed is diversity on the other end, in terms of electing and appointing leadership.
That kind of diversity would undermine the existence of these schools, however. So much of what they do is built around producing the leadership class, which then hallows their position by sending its offspring back to the very same schools.