(get his/her name from the school secretary and send the letter to the school address).
Dear Mrs Green,
I enclose a copy of a letter I sent to the head teacher of Park High School on (date). Unfortunately, despite writing to the class teacher/head of year and the head teacher, my daughter Mary is still being bullied by Jane Brown.
As you will see, I have asked the head what strategy he can introduce to stop the bullying (I am not satisfied with his reply/ the bullying has continued). Please investigate my complaint and tell me what steps the governors intend to take to halt the bullying of my daughter.
As this matter is unresolved I'd like a copy of Mary's school record to see what action has been taken on my earlier complaints. I understand that I will be asked to pay for photocopying.
Yours sincerely,
<Your Name>