Doctor Who Flatline had an Audience Appreciation Index or AI score of 85.
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.
Overall Doctor Who rated slightly higher with men than women, the opposite of all other episodes in this series, and scored the highest within the 16-34 age group. 51% of the sample thought the programme felt 'Fresh and New'.
The Sunday repeat of Flatline on BBC Three had an overnight estimate of 0.23 million viewers, a 0.9% share of the audience.