strict behaviour policy, universally upheld, including isolation of disruptive pupils= learning possible in lessons.
weak, unsupported behaviour policy, no isolation, no same day detentions = learning not always possible in lessons.
I thank God my children were in a zero tolerance school.
If you want your children made to behave, send them to a zero tolerance school.
If you don't, don't bother, don't waste our time, we can do without the parents who don't support the idea of strictly upheld good behaviour. Of course, they are the ones who's children would benefit the most, and who's children are most likely to underachieve, and sabotage other people's life chance too.