When my family moved to England when I was ten, my first teacher was Doris Irene Ball - later to become my mother-in-law and as fine a woman as you could ever hope to meet.
She was a fine singer and pianist and she used the Singing Together booklets in her music lessons though I don't remember listening to the programmes. Mind you, such was her musicality that she would not have needed them.

She was an inspired teacher of many things, music in particular, and I am sure that she helped to fire my life-long passion for traditional song. Her husband, Ernie, later in life, made a hard binding of the Singing Together booklets that were still hanging around their house. As far as I remember, they were in the piano stool. This has now been passed on to Tina and I. They seem to be rather earlier than a lot of the ones mentioned in this thread and on the folkinfo website

The ones in the binding are
Summer 54
Spring 56
Autumn 56
Spring 57
Summer 57
Autumn 57
Spring 58
Summer 58

I suppose I'll have to get on to folkinfo with the contents of these as they don't seem to have them listed