I remember seeing the original broadcast in 1982 (was it on a Saturday afternoon on BBC2?) and thinking that it was ok although I can only remember the Martin Simpson bit from it.
Traditional singers certainly got their bit in "The Other Music" as Derek says (I had a small part in that!!)but the most prominant event in my mind was in 1975 when the BBC recorded Birtley Folk Club's Christmas Ceilidh to be broadcast on their first edition in 1976. It actually involved the family and regular floor singers at the club and I don't remember too many of them forgetting their words. However following the screening 50% of the people to whom I talked to about it thought it was the best example of a televised folk club that they had ever seen;while it was roundly panned for a number of reasons by the other 50%.
Even that far back we couldn't please everybody.