what has your research on the "new place" brought up?
might be worth moving from reading you, but yeah "better the devil you know" and all that.
worth threatening the school with court before going ahead, it usually helps, especially if you can get a "solicitor" letter from your local legal aid place (if there is one where you are) as litigation is very expensive on their side so fixing the problem will be cheaper for them despite whatever costs it involves (lambeth council (officers) does not seem to see if it that way though, and they lost).