NASUWT has become the second education union to announce plans to run a consultative ballot of members, as leaders gear up for a fresh showdown with the government over pay and workload.
The National Education Union announced last month that it would hold an indicative ballot over potential strike action.
Such votes are used by unions to gauge the appetite of their members for industrial action, but a formal ballot must be held to authorise walk-outs.
Now NASUWT has confirmed it too will hold a consultative ballot over the “coming weeks” to “take forward its campaigning, up to and including industrial action, to secure a better deal for teachers on pay, workload, working hours and wellbeing”.