I think they’ve always been a lot more similar than perhaps other Doctors and companions have been. I think she quite wants to be like him, but the more time they spend together the more doctorly I suppose she’s getting and more independent of him. There are quite a few stories in this series where you see us parting ways, where we’re covering different bases and then you see us coming back together, they’re a proper team. I think they’ve been through so much together, they know each other so well that they’re entwined.