In the 80s we (myself and Mary McLaughlin, as the duo Anonyma) were frequently on the same guest list as the Kippers at festivals and other events. The first time I saw them in action was at a ballad workshop in Sidmouth, in which they sang "The Loaf and the Knife" and left a good 75% of the audience unsure whether or not they should laugh. I've told this story on FB, but for those who didn't see it - I was also sitting with Les Barker and Chris (not Sid) in a Sidmouth food tent when we were aware of two people hovering and debating with each other. "It IS him!", said one, "No, it isn't", said the other. Eventually one came up to Chris and asked "Are you Les Barker?" He replied in all seriousness that no, he wasn't, and off they went.
It could be confusing, because Chris and Sid were very different personalities and Sid was fond of flirting. Without thinking on one occasion I tried flirting with Chris, only to get a very blank stare back.
I have missed seeing him over the years. Now we won't meet again, and my life is the poorer for it.
And, following Steve's post above, my other Kippers vivid memory was more to do with Henry than Sid ... at a Durham festival, we were booked into a good hotel. We had a full day of events on the Saturday, and went back to the hotel for a quick freshen-up in the early afternoon, only to find that we had for some reason only been booked in to the hotel for one night, and the room had been cleared of all of our belongings (which were sitting behind the reception desk), ready for new occupants. I went in search of someone who could sort out where we could stay that night as we weren't going to drive back to London that late. Couldn't find a festival person, but did find Henry Kipper presiding over their merch stand. I blurted out the story to him, expecting sympathy. He looked at me as only Henry Kipper could, and said "Waal, if they put riff-raff like you into a hotel like that, what did you expect?" (We were later found a b&b, by the way)