Proportions vary between different types of schools . governors are appointed for a maximum of 4 years and the head teacher is a staff governor but can decline taking up this postion.
Independent schools generally have a governing body but usually decide on their own requirements of the exact compostion.
Senior Management team works closely with the head and the structure of the team allows flexibility in assigning strategic direction of the school. It is usually made up of the head teacher and deputy head , depending on the size of the school the team could be bigger with senior teachers with certain responsibities for example leading one of the key stages. The SENCO can be part of the team.
The main role is to set a strategic direction of the school and then amange it making sure that it is done in the most efficient way so the children can receive the best education. They must be aware of the school and launch new and relevant initiatives in way so that the school is totally behind it and