David S.:
This is an old conversation, but as a CFF fan I thought I'd contribute, as I have a bit of extra info: the CFF and The Children's Film Unit (they're the ones who let kids make the films as well) are/were completely different bodies.
The Children's Film & Television Foundation still exists, run by Anna Home, who produced many BBC children's dramas in the '70s. There seem to be plans for it to be much more active again in the near future.
Sadly I think the Network dvds have finished, before we even got to Sammy's Super T-Shirt, The Glitterball, Kaydong or High Rise Donkey. It was great to be able to see some of the Sixties ones.