The TARDIS and Clara have a relationship. Actually I don’t think we’ve talked about this in interviews before. It’s something that’s running through the series.
Instead of it being like, “Does so-and-so like Clara?” The TARDIS and Clara have a bit of a face-off. So, the Doctor is obviously bringing back somebody new. I think we’ve done a whole additional content scene of me talking to the TARDIS, and the TARDIS is making fun of Clara. They kind of have an argument. They’ve got a relationship individual to the Doctor where they have a dialogue.