“A head teacher is the most senior teacher and leader of a school, responsible for the education of all pupils, management of staff, and for school policy making.”
What the definitions do not tell you is that it can be a very lonely job, even when you have very supportive governors and a hard working staff. Sometimes you need someone else, who is not part of the school who has an external view, with whom you can discuss things before you present them to staff or parents. Sometimes you just need someone else to do the things that can be mundane or time consuming – while you concentrate on the strategic stuff!
DES can help you in a number of ways.