Here’s a vintage interview with Mark Hamill that just popped up on YouTube. It’s from a show called Film Talk, taped in late December 1977 prior to the premiere of Star Wars in London. One clip depicts the cry of a Krayt dragon (mimicked by Ben Kenobi) as it was in the original version of the film.
According to the interviewer, James Sinclair, the interview was “shot at Imperial College London in late 1977 and edited in 1978 [October 13]. Was shot in what is now the Grantham Institute for Climate Change. Then it was the old TV studio run by Colin Grimshaw (now retired).”