Doctor Who - Extremis had an Audience Appreciation or AI figure of 82
The Appreciation Index in an indication of how much viewers enjoyed the episode. It is based to the reactions of a selected panel of viewers, who rate the episode shortly after transmission.
82 is considered a good score, roughly similar to the scores achieved by the last series of the show,
The highest score for the evening on the two main channels was for Casualty, which scored 85.