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I remember her well, Paul, although I must declare that I preferred her predecessor Dr Liz Shaw, who only did one season (Jon Pertwee's first).
That said, I really love Pearl Mackie's portrayal of Bill Potts and I agree with JK that she's bringing Peter Capaldi's Doctor to life. I rather enjoyed this second episode, too, because it had pace and lacked the labyrinthine tedium of Moffatt's earlier approach from Matt Smith onwards).