One of the pleasures of press day (on any paper, I should hope) is seeing readers' letters fall into place on the page, and marvelling at the unique knowledge they're prepared to share (when they're not spoiling for a fight, that is). The example below, from this week's issue of the TLS, begins as a response to some observations in the paper's NB column about the current scarcity of decent second-hand bookshops in Oxford, and turns into something else . . . .