Hundreds of thousands of teachers will be balloted for strike action over pay in a move that could bring major disruption to schools this winter.
The NAHT, which represents heads, is expected to announce this week that it will ballot its members in England for strike action over pay for the first time in its 125-year history.
Schools could be forced to close if heads walk out, as many heads and deputy heads hold the necessary safeguarding roles to keep the doors open.
