I have reread this thread now and I have some bits to point out.
In your OP you state...
"But now they have been there a couple of months the head teacher held an assembly to tell all pupils with long hair must wear a pony tail".
So ALL pupils HAVE been informed of the new rule then?
"The school have admitted they have a year 6 pupil whose had his hair long the whole time hes been there...when i asked if he had to wear a pony tail they said no but now he will have too...so this is a new rule just for my son"
Actually its not just for your son if the other long haired boy is going to have to tie his hair back as well.
"it wasn't the school rule, they are thinking about making it a new rule but no meeting with the governers has been held yet".
So have the pupils been informed or is it still in the pipeline?
"and what bothers me more is the school knew this and also knew he had long hair...but never said anything when we were visiting and trying to choose schools...they just said that they would gladly welcome my boys and make allowances for special needs and look forward to them starting if we choose their school"
The would make allowances for his special needs HOWEVER he still has to learn to follow rules whatever his needs are.
"...i asked y son if the girls in his class are being spoken too about it when he is and he said no"
But according to your OP ALL pupils were addressed during assembly.
"if i stopped fighting this battle with the head i would be spending my energy fighting a harder one with my son...believe me"
Yep sounds about right for being a parent!!
"Refusing to administer medication"
The document is called ?Managing Medicines in Schools and Early Years Settings?
Para 16. Of the guidance states:
?There is no legal duty that requires school or setting staff to administer medicines. A number of schools are developing roles for support staff that build the administration of medicines into their core job description. Some support staff may have such a role in their contract of employment. Schools should ensure that they have sufficient members of support staff who are appropriately trained to manage medicines as part of their duties.?
"He will have it trimmed...the school dont want it trimmed...they want it crew cut."
Well what you stated is that the school have given the option of either tying it back or having it cut. So heres the thing why not get it tidied up and thinned out and then you will be able to tie it back?