Hi Barbara
This has been a fantastic posting, but why dont you and the other "prefabbers" put your heads together and generate a local interest story and see if the M.E.N would be willing to take it up.
I am sure many more people would come forward with stories and photos.
I bet most people in the heaton park area dont know about the two sites, I for one was one of them, yet the park was my playground in the late sixties. We did find the remains of an old swimming pool down by the boating lake, I do think even today it can still be seen.
Ken