Parents of children at Prince Henry’s Grammar School in Otley, Leeds, protested wearing gags outside the school on Thursday of last week.
Parents are angry that they have been denied a ballot on the school’s conversion to academy status, which took place on the day of their protest.
Teachers in the NASUWT and NUT union have struck several times against the conversion.
They won enormous support from parents, students and other trade unionists. No further strikes have been called.