The strike referred to by LMS was the ten-day General Strike of 1926, which lasted from May 3 to May 13.
It was called by the Trades Union Congress on behalf of the coal miners, who were fighting against wage reduction and longer working hours.
The degree of support for the strike from British workers shocked the government, and indeed the TUC, with almost two million people taking to the streets. Middle class and aristocratic volunteers maintained essential services, as portrayed in the novel Brideshead Revisited.
The strike was ultimately disastrous for workers, as they achieved none of their demands and ended up with worse conditions than before. The government subsequently made it more difficult for trades unions to strike.