If you're prepared to spend just a very small amount of money, there are two classic documentaries on the matter available for rental on Vimeo.
'Despite The Sun' was made from camcorder tapes at the time and sold on the picket lines. It's 51 minutes long and will cost you just £0.99 for a week's rental:
https://vimeo.com/ondemand/despitethesun
'Wapping: The Workers' Story' won both 'Best Documentary' and 'Best Director' awards at the monthly Hollywood Hills Film Awards just last month. The documentary runs for 70 minutes and costs £2.25 to rent for 24 hours:
https://vimeo.com/ondemand/wappingtheworkersstory
Both of those documentaries take up left-wing positions though and (as the strikers did at the time) largely ignore the essential reality that advances in technology will inevitably lead to job losses in some industries.