Virginia Woolf, then Ramsey Campbell, Lisa Tuttle, Clive Barker, and film guys Roger Corman, John Carpenter and Pete Atkins

This labels itself as the only surviving recording of Woolf's voice, from
Words Fail Me, on the BBC, April 29th, 1937.

(courtesy Dangerous Minds; transcript and background at AtThisNow)

"April 1990":  Barker hosts writers and filmmakers for a roundtable on horror and creating a millenium-ending horror, taking off from Stevenson's Dr. J and Mr. H (which, of course, has been getting even more of a workout since); this is in the fine tradition of such roundtables as the Harper's Magazine session with Robert Bloch, Suzy McKee Charnas, Gahan Wilson and Harlan Ellison or the shortlived tv series Bookmark and Nightcap

Courtesy of Kate Laity. As Campbell notes on YouTube:

It was planned as part of a series that would bring together six exemplars of various kinds of creativity. Another was devoted to alternative comedy. Apparently one of the comedians got so aggressive that the producer intervened, and he assaulted her. That was the end of the proposed series.

While Clive played host, he wasn't responsible for the line-up - they consulted me.