Industrial action looked set to intensify after Britain’s largest teaching union announced a series of strike days over pay next month in England and Wales.
The National Education Union says its members voted overwhelmingly to walk out as part of calls for an above-inflation pay rise.
The announcement came as public sector workers hold a wave of walkouts for salaries to take into account double-digit inflation.
NEU joint general secretary Kevin Courtney says they believe the government knows there needs to be a correction on teacher pay.
It said each school will only be affected for four days.