'Concerned' teachers step up protests.
Members of the 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 will undertake similar action from October 3. The NASUWT has been involved in action since last December, but has decided to escalate its campaign, in conjunction with the NUT.