Ofsted is regrouping. The body responsible for inspecting state schools has announced an overhaul – as well as leaking widely the name of its most likely new leader.

Loathed, respected or just about tolerated, depending on who you are, Ofsted is seen by many as the most important influence on the daily lives of schools.

The changes involve reducing the current 27 inspection categories on which a school is judged to four – teaching, leadership, achievement and behaviour.

My concern about the school inspection is that what is most important in education is not an objective process, a school is not a production line that can be measured and quality assessed.

Take teaching. A completely useless lesson is recognised by everyone.

But I have, over and over again, seen wise, experienced and capable teachers argue over the quality of a videoed lesson.

Attempts to create rigid criteria so that this diversity of opinion can be diminished only result in a rather dreary standardisation of practice.

Leadership is controversial.

The man expected to lead Ofsted sees the successful head as a ‘lone warrior’ – about as far from my own view as you can get.