A BBC "Play for Today" from 1974. It is a dramatic reconstruction of a strike by mainly women clothing workers in Leeds in 1970.
This copy was originally ripped from an old VHS tape. Unfortunately, there was one minute or so (around 1hr 43 min into the film) which obviously wasn't recorded correctly, so it has been snipped it out. I don't think this does much damage to the overall integrity or political message of the film!
See also IMDB description: