Heaven Sent - AI:80

Doctor Who: Heaven Sent had an Audience Appreciation or AI score of 80.

The score is lower than average for the series, reflecting the unusual nature of the story, which saw Peter Capaldi alone for most of the story.

The Appreciation Index or AI is a measure of how much the audience enjoyed the programme. The score, out of a hundred, is compiled by a specially selected panel of around 5,000 people who go online and rate and comment on programmes.