I stumbled across this video today. A special edition of Anglia TV's "Bygones" programme from the 1980s. Features a few shots of early record and radiogram production, a scary looking auto-changer and some restoration of archive recordings. No editing software here!
https://www.youtube.com/watch?v=3CsIZed38Go
It's just the first 25 minutes for HMV, but the other films are also interesting.
Make yourself a cup of tea and enjoy.
SR