In my son's best interests

Yesterday, I signed the lease agreement for the flat. I am moving to a new town, far enough away to make it impractical for my son to attend the same school. But this process has taken so long that there is now only 6 weeks of the school year remaining, and finding a school that will take him for that short period will be incredibly difficult. It's a shit system. Education is a right, and state schools are obliged to provide that education. They should not be able to refuse, should a place be available. I will begin arguing that point on Monday. He is not happy at his present school and for the sake of his education needs to go to a better school. And the sooner the better.

However, should no place be available anywhere close (enough) to my new place to make it feasible for us both to move, I have a very difficult decision to make.

G wants to live with N, his mum's boyfriend, until she is released. Apparently he wouldn't mind, and has a job that is flexible enough that he can take G to school and pick him up. From a practicality perspective, that's great and solves my problem. However, I don't really trust N, I will miss having my son around, and I am not convinced that N would make a good single parent. As G's legal guardian, I am also not happy with the idea of retaining responsibility for him but relinquishing control over his day-to-day life.

So what am I to do? What is is G's best interests?

His welfare and education come first, so if a position at a better school IS available, I will move him asap. If not, perhaps my mother and N could share the load of looking after him during the week and ensuring he gets to school, while I get to see him on weekends.

I will have to talk to my mother, and to N. A difficult decision needs to be made, but I am the only one who can make it.