History. 4 of 7: four unions called a vote within a month of their threat.
Hunch. The only past fight with Ofsted, in 2025, ended in talks and no vote, and the minister already wants the inspections changed.
The second NAHT market resolves the same way on the NAHT press room: YES if a vote of members on action is announced or opened by 9 November, and NO if not. BBC News and The Guardian are the backup.
We looked for cases where a UK union of senior staff who rarely strike, mostly head teachers, publicly threatened action against the government or a regulator. We found seven since 2009: five at NAHT, one at ASCL and one at the FDA, the union for senior civil servants.