Every once in a while some unique material pops up on YouTube.
This clip was published by Glenn Veness and features live footage of a spontaneous beach concert that took place in Hastings in 1991 so during the Cooltide era. I don't have an exact date, yet.
Glenn: "John was drinking in the Lord Nelson with the fishermen when, after a few drinks, they talked him into playing on the beach. He played all afternoon for free, and went round with a wellington boot collecting money for local charities. This is a great track from that afternoon called Big Muff."