The film is a dramatization of the Ford sewing machinists strike in 1968, a piece of history that some people may not have learned about. The strike occurred at the Ford Dagenham assembly plant. The female workers went out on strike against sexual discrimination and desire for equal pay. This ultimately led to the Equal Pay Act of 1970.
I was not aware of all of this history, but nevertheless found the film interesting and can say it's a must-see. Be sure to check it out on DVD.