It was utter tripe. Housemate pointed out the rubbish scenery - the odd bit of street furniture but otherwise blah. Terrible child actors again too - especially the one that apparently was the voice of Peppa Pig. Not quite as bad as Robin of Bollocks, but hanging around a whole dire episode for three wonderful seconds of Missy was painful.
I wish they'd write something decent for Capaldi's doctor - the good episodes of this series would only have qualified as average episodes of some earlier series.