Just finished Ken Clarke's memoir, Kind of Blue.
Always liked him and most of his political views, still do.
There's lots of insight in the book especially about the eurosceptics and their 35 year old war on Europe and a very informative summing up of the errors Cameron made by pandering to them and regurgitating many of their views hoping he could mollify them. It had the reverse effect of course. He ended up envigorating them and their supporters, as though he was one of them, even though he said all along didn't share their aims.
And then they started saying all kinds of stupid stuff gifting them Project Fear.
But the primary error was trusting such an important and complicated decision to a referendum in the first place. The second was allowing a simple majority to be the decider. Overall it was a stupid and unnecessary gamble which Cameron announced without having bothered to consult any colleagues.