Trying to organise teachers to strike indefinitely is basically impossible as no teacher wants to damage the chances of their students. So a replay of the miners' strike of the mid 1980s will not happen (and I'm sort of glad about that given the permanent polarisation that action caused in the communities most affected). In the modern UK, an indefinite school teachers' strike would cause significant disruption as most families have both parents working.

My colleagues might manage a token one day strike now and again, but basically that is your lot. What is termed 'action short of a strike' can actually be more effective in certain circumstances. Cutting off the flow of data really bothers the management but the everyday work of the institution continues; students continue to be taught, to have work marked and to receive feedback designed to improve their understanding of the material.