Hi everyone - thanks for the support. At least I know that my reaction is normal and I am not being over-protective! I will be speaking to them on Monday...
Cathy A - DS is now very wary of this boy, I have told him that I will speak to the teacher about it for him.
OHGrandma, I will be telling DS to go and call a teacher next time - good idea!
Chrys - we have also had a whole lot of verbal taunts from one of the older girls, we just seem to have got over all that and now this has happened! In the end I went to the teacher and she sorted it out as, even though it was just verbal, it was starting to upset DS and there was one particular day when it turned into her pulling him around.