Many of these images, and others by Jarche, appeared in 'PD News', the company's well-illustrated magazine. The captions in PD News may contain slightly fuller location information, but they won't name the people who appear in the photographs.
Placing an illustrated artcile in a local newspaper would be the best means of trying to identify the people featured through descandants. Try liaising with Big Pit the Welsh National Coal Mining Museum, as they have, I think, tried similar exercises with people featured in 1950s photos.