Yesterday I had a call from the school saying my DD had shut her finger in the toilet door, she was fine they were just applying a wet hand towel to it. When I picked her up at home time her fingers seemed fine if a little bruised so I asked her how it happened as we walked home. She told me that Claire namechanged had needed to go to the toilet and my DD was asked to go with her as Claire isn't allowed to go by herself. I asked my DD if she knew why Claire wasn't allowed to go by herself and she didn't know. Later I remembered that Claire has epilepsy, which I knew from helping on school trips.
So I talked to the teacher this morning...yes they are using other pupils to accompany Claire on her trips to the toilet during lesson time as they can't spare an adult to go with her! 
But it's ok as Claire goes into the cubicle by herself!! 
Apparently during during lunch etc they do have an adult to go with her.
When I said that she's just as likely to have a fit while washing her hands as sitting on the toilet that didn't seem to have occurred to her!
The children aren't aware of Claire's condition so how traumatic would it be for a 5 year old to witness when it's just the two of them let alone if it happened during a lesson with adults around!
The teacher tried to justify it by saying that Claire hasn't had a fit in school yet
This teacher only started in January and this system was already in place so she didn't question it! 
Would I be over reacting to try to speak to the head of EYFS about this?
If you've managed to read this far, thanks.