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In page Knock Knock (Doctor Who):
"After the episode was first broadcast, people in the UK could view a binaural version of the episode on BBC iPlayer.[1] The episode was watched by 4.32 million overnight, up a half-million viewers from the previous episode, "Thin Ice", and the highest-viewed story overnight since the series opener "The Pilot".[2] The episode received 5.73 million views overall, up slightly from the previous episode, and received an Appreciation Index score of 83.[3][4]
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