In the 1960s, at a time when I took myself more seriously, I went to work for the Observer in what I mistakenly believed was a rather important position. One afternoon, soon after my arrival, a stranger walked into the office I shared with two other people. He was neat, quite short and stocky, and, I seem to remember, he wore a pale tweed jacket. He had a pleasant light tenor voice and the air, perhaps, of a popular geography master at a prep school.