Oh, all right, seeing as it's you, Joan.
This was a project I had lined up for animation, but I couldn't get the funding. I even have a contingency plan to make it as a British thing called Boggurts.
What I found out the hard way was that no-one is interested in a well thought-out, well designed project that hasn't already made it into print. Unless, that is, you already have a long term relationship, (an "in") to a TV producer, such as Ragdoll has with the Beeb.
These long term relationships are almost always legacies from the 70s and 80s, when the process of commissioning new series for kids TV was very different from what it is now.