Wasn't too sure about Catherine Tate as the Doctor's assistant to begin with. I didn't think the Christmas episode with her in two years ago was the best offering, but she is doing a cracking job in the series imo.
I hope David Tennant doesn't pack it in after this series. It is strongly rumoured, but not confirmed yet. I think he is the best Dr Who ever - and I am old enough to have seen all of them since John Pertwee.
