The union representing headteachers is to hold its first-ever strike ballot in the row over public sector pensions.
Members of the National Association of Head Teachers will vote from September 29 on whether to strike for the first time in the union's 114-year history.
The ballot result is due on November 9, a few weeks before the TUC's day of action in protest at the Government's controversial plans to increase pension contributions for millions of public sector workers.
The union represents 28,500 headteachers, as well as deputy and assistant heads, in schools across Wales, England and Northern Ireland.
The Press Association, photo by Dave-D