Yes, the circular breathing technique was very prominent in those gigs. Over 2-3 years I caught several appearances by the Quartet plus two I think by the Octet so he was a frequent visitor (Ronnie Scott was a personal fan I think). Billy Higgins almost seemed like a fixture, as he appeared each time with Cedar Walton’s group as well. Happy days !
The Octet had an interesting lineup. Danny Moore, Mario Riviera plus Frank Strozier on at least one occasion. Not to forget Harold Mabern and Iris Muhammed as well.