I wasn't... in the event very sorry to stop doing clinical work for reasons of administrative hassle and feeling it was all... getting a bit much for me, all the amount of stuff going around my head and more and more that I didn't really understand. And so that wasn't sorry, although at times I very much wanted to go back and my successor, who's close very often rings me up and we chat over a problem about clinical medicine in a way, which is for me theoretical. But I... I was – a chap who was the Professor of Medicine at the London School of Hygiene and Tropical Medicine heard I was retiring and asked me if I'd like to go teach there, which I did for many years actually, about maybe 12 or 14 years, maybe more, I don't know, a long time after retiring. And I mainly taught in the Diploma of Tropical Medicine, the Masters. Obviously I didn't treat it, but I said to them I'll do anything, but I won't do worms. You know, I won't do things I don't like and don't understand. But I did the things mainly I, you know, knew a bit about, and I just loved it. I just loved it. They were all postgraduate and that was another change in my teaching. When I was young and a registrar, I liked nothing better than teaching brand new students who didn't know anything about anything, partly because I think they were brands to be saved from the burning, and partly because they had very interesting notions, which of course people even at registrar had usually stopped thinking about and some of them were rubbish, but you were thereby thinking in a different way. And then I, as I got older I really much more enjoyed postgraduate teaching, teaching some – not, not from feeling about the students, it's was just I got, I felt – didn't quite feel I was as much in rapport with them as I got older and I preferred doing postgraduate teaching. And the London School, they were from all over the world, absolutely all over the world. They were very motivated. They'd come a long way, they were paying a lot of money and they were burningly interested in teaching and also they came from completely different, diverse medical backgrounds which was quite humbling in a way because you realised even after a huge number of years doing medicine how narrow your actual medical base was. They'd done, oh, all sorts of things and I... I love those, really interesting. And I did some other things like going on with the writing a lot, many years after and some lecturing.
