Sorry Lindy,
hope I haven't spooked you but I only learnt about this in the Echo, in the late 70's early 80's,when I think the scool was built! I used to pass the dogtrack(though I didn't know that's what it was) on the way to work,and thought it looked a right dump,black painted, corrugated iron!
The Echo probably has this in it's archives, and though I can't be sure,even the Merseymart,had some sort of story about it?
Steve.