a lot of schools have there won budget, they get XXXX amount of money per pupil, the reason i know is of my misses friends is a teacher and they could only afford to pay her part time, so thats all she works
a lot of schools will use the same people for years, thats why it can be hard to get in on them, and only come up for a new person, when someone else takes over or there budget shrinks
like in any other career, i am wary of a contract that comes up that has been with the same people for years, yet they dont want to do it this time, tesco is a prime example as the contracters cant wait to get out of the contracts with them, as they are a pain