It was my understanding that headteachers were able to ask their staff whether they were intending to strike, but that it was not a requirement of the staff to answer, or to answer truthfully. I recall previous occasions where strikes have occurred where we have told parents of certain classes that their children can't come in on that day as the class was shut due to striking because they had informed the HT in advance that they weren't striking.
My HT has told us that she is not allowed to ask people which union they are in. Is this right?