Schools will be hit by escalated industrial action by teachers from today in a row over jobs, pay, pensions and workload amid "deep concerns" among staff over their profession.
Members of NASUWT will only produce one written report a year to parents, will not submit lesson plans to senior managers and will refuse to invigilate mock exams.
Teachers will be able to supervise activities outside school hours, such as sports clubs and drama, if they are happy to do so, but will refuse if it is imposed on them by a headteacher.
Union members will also only send and respond to work-related emails during school hours.
The National Union of Teachers (NUT) will undertake similar action from October 3.
More top news
Mixed fortunes across the UK tomorrow. Still breezy across the north.
The Labour leader said socialist politics would not be put "back in a box" as he appeared on stage at the festival.
There are reports that at least some MPs and Lords have been left unable to access their emails as a result of the attack.