There’s a campaign group with a mailing list and everything: Save Children’s TV.org.uk.
To quote Colin:
If, for the sake of argument, we were instead facing the collapse of commercially funded adult tv, then we’d be losing shows like Corrie, The Bill, Taggart, Midsommer Murders, Tonight, etc., and replacing them with US imports. We would all have a sense of UK culture being under threat and we would want something done – so why shouldn’t children’s culture be given the same protection?