One aspect that I did learn something about was that the "Remainer Unicorn" that Brexit was all about avoiding EU tax rules was untrue. I had thought that tax rules was insufficient to explain why the rich wanted Brexit - after all, the rich can move their money about as they wish.
The book was obviously written before the election and so is almost out-of-date. But if people didn't learn what Brexit was about in the last three years ... they are about to find out.
