Made the move back with the wife 6 years ago. The first year I believe you will be charged the same fees as an international student, but after being here for a year she will be charged as a local student, that's provided you are married of course.
My wife has been a TA for the last 3 years. I think he course cost a few hundred pounds at a local college.
Hope this helps, but the info may be a little out of date.