Life had stopped for her a long time ago. She was so out of touch with her feelings that she had no joy in her life and no concept of the fact that she could be wrong. She delivered her care of her insane patients in a killing manner, but she was convinced she was right.
It was lovely to do The Knock because I haven't done anything really significant since Doctor Who.
One of the things I thought a lot about was how can we get the views, for instance, the main plaza, you look up to Telegraph Hill from there and therefore it would be a disaster to close that view off.