Thought I'd start a new thread as the state vs private thread is soooo long; and wanted to focus more on possible solutions.
So, fwiw, here are some ideas (aimed at secondary level):
Abolish private schools
Abolish "religious" schools
Abolish grammar schools, foundation schools, CTCs (are they still called this) and any other form of "specialist" school.
Create across-the-board comprehensive system.
Insist on setting. No mixed-ability classes for academic subjects. Allow plenty of opportunity to move "up" and "down" the sets.
Have units within the schools for problem pupils. Remove them from classes as soon as they become disruptive.
Problem pupils who don't improve and who don't have parents that support the school to be sent to boarding schools. (Not necessarily boarding schools for disruptive pupils but normal boarding schools.)
Restrict higher education to top 20%(ish).
Bring back apprenticeships. (Where's a plumber when you need one).
Money saved on universities can go to restoring student grant and better funding for schools.
Train more teachers and train them better. Don't allow teacher training institutions to spend 90% of the course on educational debates and "gender issues" etc. Classroom management and subject specific skills are far more important.
Anything I've missed (tongue-in-cheek)