What is the title for this TV series that I only very vaguely remember from my pre-school years:
It was on in the UK, probably 1975 or 1976.
It was a live action show, and was probably a series rather than a single show or film.
It was similar in tone to The Tomorrow People, but it wasn't that.
The characters were all children, and they all wore the same uniform, possibly yellow. This is why I recall it as sci-fi. Actually there was one episode where an adult appears but he was subdued by the children and kept prisoner.
My recollection is that the filming location was in some kind of quarry.
I apologise for the lack of details but it was a long time ago and I was really young. Does anyone know what this is?