I have no idea what must have gone wrong with the earlier correspondence, unless it turns up in a pile I have not yet excavated. I got on well with Les, both in my capacity as a student and as a students’ union officer. He was, in my experience, a wonderful lecturer and steward of his undergraduate students. So my comment about the long-forgotten faux pas would have been tongue-in-cheek on my part, as would Les’s rebuttal have been on his part.
