Chox - check your local college, mine does part time courses for teaching assistants, free child care, and they'll help you find a work experience placement which could lead to a job after you finished the course.
Worth a look
I'll own up - Chox was me after having a particularly bad day at work ! I still like the idea, as DS starts school in Sept & I'm not sure how to juggle everything yet. However the chances of me getting a job in the school where he'll be is probably very remote.