Unexpected Doctor Who reference

Got Mitch Benn's Sing Like An Angel for Christmas. Now, I know Mitch is a bit of a fan, but usually if the song isn't actually about Doctor Who (such as "Be My Doctor Who Girl", and the heartfelt "Call Me During Doctor Who And I'll Kill You") it doesn't come up. But "Richard Dawkins" contains the glorious lines:

He's evolution's top banana,
And he's married to Romana,
And that kinda makes him King of the Nerds.