I think I've seen one episode of Horrible Histories, but not the other two you mention. Generally I keep an eye on the BBC's children's drama output (and why has no one yet reviewed the new season of Sarah Jane Adventures? (Though I am as remiss in this as anyone else).

I note that, despite being 'tweeted' about their appearance in the song there was no mention in today's Mayo and Kermode show...

And I'm all in favour of making this a Christmas No.1.