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Article from here
What was it like shooting your last day on Doctor Who?
It did not feel real at all. I mean, it’s become more my home than my home actually is. It was just really weird. But we film out of sequence as well so, my last part with Peter, I couldn’t quite look at him because it wasn’t supposed to be a sad part. It’s hard to go into detail without telling you anything, but I was really overwhelmed. I recognize that it’s a special part of my life. The storytelling is so dynamic, and big, and whimsical, and magical. You feel like you’re in a fairy tale and it’s really hard to walk away from that. It’s a lot more than just a job — the friendships I have with the crew and Peter, it’s very hard to say goodbye to it.