We were about to go into a 25 minute interval, so 10 or 20 seconds spent retuning could easily have been recovered. Someone in one of these threads mentioned Ralph McTell's time constraints but that was different - he was coming up to the end of the show which had to finish dead on 10pm.

As well as the professionals, I would guess that a good percentage of the paying public were also musicians, and could probably have put on a better performance. I was embarrassed for him.