It’s not often that browsing the genteel aisles of Waterstones reminds you of madmen storming the Capitol in buffalo-horn helmets, but that’s the buzz I got as I briskly scanned the History shelves. I happened on a slender volume called How To Stop Brexit, written by Nick Clegg. I’d never heard of the book (a realisation that probably attaches to quite a lot of books by Lib Dem leaders) so I pulled it out, with curiosity.