I'm a long-time retired teacher. Long ago, I left UK, mainly because there existed no real career progression for classroom teachers: to progress past Head of Department status (and get a proper salary increase), you had to move out of the classroom and become a Deputy Head or something similar. I wanted to be a teacher, not an administrator; so I moved my family abroad. (Children were still (just) pre-school.)
I always worked in state-funded schools, essentially I suppose for ideological reasons, but also having seen the damage done to British society by its own brand of private-school organisation (albeit that other countries haven't suffered quite so badly in such regard).
So, anyway, I'm posting here now just to suggest how things could be different for teachers and schools.
An anecdote. Not long after I started in my first job abroad, I was walking along a busy school corridor chatting to a colleague, on the way to the staffroom for coffee-break. Two teenagers started fighting nearby; of course I moved to intervene. My new colleague pulled me away. "What on earth are you doing?" she asked. "You're a teacher, not a police officer!"
Teachers were not required to engage with pupil behaviour; the school employed people (so-called 'educational consultants') specifically to deal with children's behaviour, to supervise (perhaps somewhat harshly to my eyes at the time, at least initially) children who could not, or would not, behave themselves, also during breaks and when a teacher was absent.
Result? Teachers could teach. Any real misbehaviour and a child was removed from class, to spend time being supervised/assisted by the educational consultants. Of course minor matters - inattention in class and so on - could be dealt with by the class teacher; but no classroom teacher had to deal with any severely disruptive pupils, so the majority of children who wanted simply to learn got full-time teaching.
Teachers were better paid by seniority, and for fewer contracted hours, so there was no need to move on to administration to make a career. Also, extra-curricular activities - sport, social, cultural, whatever - were separately staffed; no teacher involvement there either. Class teachers - experts in their subjects - exclusively taught those subjects. (Although this did not preclude getting to know pupils well as children; it was possible to maintain a child-centred teaching manner even given this explicit overall apparent subject-centredness.)
I recommend this system. Of course it costs money. It needs proper recruitment and career-structure for non-teaching staff as well as for teachers.
Any chance of such a system in Britain? Not, at any rate, so long as the country's rulers are so badly - and systematically - miseducated by those expensive private schools. But, well, you have each a vote.