Once upon a time there were far more political bookshops around the country than the handful left today, including several right in the heart of central London's bookselling zone around Charing Cross Road. These shops were very convenient to help the Met Police's Special Branch keep track of things - they could (and did) short-circuit a lot of research into the political scene by simply strolling up the road and buying armfuls of the radical papers and magazines on sale.
But the…