My DS has had some fairly significant issues at school. He can be a very difficult and complex boy (SEN issues included as well as being a pain in the bum hormonal teen). Over the past few weeks I've had cause to speak with her a few times either in person or via email etc (all needed or on her request I'm not bombarding her with nonsense) . She is outstanding and I am blown away by her dedication to support my son. I have told her this and thanked her. Would it be weird to email the head to express this?