There is only one recording to come this season. Most of the people you would expect to pop up in a season have now popped up. So I'd expect a second outing for a semi-regular, either Tony Hawks or Sue Perkins. There will be someone who appears occasionally - Tim Rice or Stephen Fry or Kit Hesketh-Harvey or perhaps Chris Addison. And then I'd expect a newcomer. There hasn't been a debutant so far this season and I don't expect this will be the first season in five years not to introduce someone.