I trundled across the playing field of the University of Edinburgh by shopping trolley and suitcase on wheels. It was difficult to balance myself when lying prone on my two vehicles, but manageable so long as there was a slope.

At one point two young women blocked my way. When I asked them to move they looked directly at me. Even though her eyes were obscured by sunglasses, I could tell that one of them recognised me. She piped up ‘I know that you’re really busy having just returned from Harvard, and that you are going back soon, but could I possibly arrange to meet you next week?’

I expressed my regret that this was not possible, without bothering to correct her misassumptions. I had absolutely nothing to do with Harvard and she was obviously mixing me up with someone else.