Flatline scored an Audience Appreciation Index or AI score of 85, equal to last week’s Mummy on the Orient Express, the series high.
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.
The episode rated higher with men than women and scored the highest within the 16-34 demographic.
An AI of 82 is the average rating for all drama across the BBC.
| Final Rating | Audience Appreciation | |
| Deep Breath | 9.17m | 82 |
| Into the Dalek | 7.29m | 84 |
| Robot of Sherwood | 7.28m | 82 |
| Listen | 7.01m | 82 |
| Time Heist | 6.99m | 84 |
| The Caretaker | 6.82m | 83 |
| Kill the Moon | 6.91m | 82 |
| Mummy on the Orient Express | 7.11m | 85 |
| Flatline | TBA | 85 |




