I'll write you up a draft, but please don't actually use it, just use it as a template to adapt form?
Dear *Head Master*
I would like to raise a concern I have regarding my daughter and *BOY*.
Last week whilst (my daughters name) was trying to use the slide in the playground *at playtime*, *BOY* felt it was appropriate prevent people from accessing the start of the slide. Due to my daughters history with *BOY* this frustrated her and as we know, she tried to push *BOY* down the slide. *BOY* then retaliated by punching her in the face. This is not the first time *BOY* has deliberately annoyed my daughter or other pupils.
Now, I have spoken to my Daughter and told her that her behaviour was unacceptable. However, both I and my daughter have concerns about *BOY* in the future.
It is no secret to the other parents that *BOY* is not the best behaved, and this is why *(other boy)* had to leave *last wekk? month? year?*.
Therefor, I would like to make sure that the actions of *BOY* were followed up, and I was hoping you could advise *BOY* to leave my daughter alone and not wind her or other pupils up, and I shall advise my daughter not to push or even talk to *BOY*.
I understand they are both children, but I do not feel like pupils at the school should be able to be punched in the face without some sever consequences. This is not an example I want my daughter to be exposed to. She has physical damage to her face (a fat lip).
The problem may be arising from lack of supervision at playtime. If that is the case I suggest you focus this supervision onto *BOY*.
Yours sincerely,
*Name*.