The best obituary of JMS I have seen yet is in the Guardian (22 April), here.

All the obits mention JMS's liking for discussions to be - er - lubricated. I can confirm this from personal experience. I met JMS once when he was in his early seventies, after he had given a paper at a seminar on the work of Francis Galton. We continued our conversation in a local pub, and after an hour or so - and several pints - he was in much better condition than I was!