I make my first visit in a year to Notting Hill’s Book & Comic Exchange. I could go more often, as long as I’m not selling. If I’m selling, once a year is about the limit, although, if your ego is intact, there is something strangely thrilling about the level of disdain with which some staff there treat customers wishing to sell books. I say some staff. When I lived down the road in the 1990s and would go along with unwanted review copies to convert into part-exchange vouchers, there was one...