I have been trying to find the Sarah Jane Adventures Specials (webcasts) but they are no longer available and haven't been reuploaded anywhere I wonder if there's anyway to find them again, also the Joseph and Taz files eps 1-3 & 5 as well only episode 4 is available now.
I'm trying to archive them for the very reason I can't find them so they don't get lost forever but they may end up already being that way, two were from childhood shows I watched Sarah Jane Adventures connected to Doctor Who and Tracy Beaker which had a sequel series called the dumping ground where Joseph and Taz webcast/minisodes are from.
Here's three of 'The Sarah Jane Adventures Specials'. They the site doesn't seem to have "Rani and Clyde" and "Chris Meets..." but its better than nothing. Don't know much about the other series I'm afraid.