A quick check of my 1991 Sidmouth Working Programme (aren't files wonderful?) shows that the Theatre Bar singarounds were chaired by Hugh Diamond (3 days), Tim Edwards (2 days), Ken Hughes and Gilly Hewitt (1 day each).

Of course the programme doesn't state which day JKL were filming.

I don't think I dropped in to the Bar that year, at least not during those sessions (10.30 - 12.00 a bit early for me......). May well have been in the bar at other times although, according to the programme I only MC'd one thing in that complex all week.