The score was the second highest of the weekend, only beaten by Foyle's War on ITV1.
The AI - Appreciation Index - score is a measure of how much an audience enjoyed a programme. The average score for drama is 77. For any programme, a score in excess of 85 is excellent. Any score in excess of 90 is exceptional. Any programme that falls below 60 has received a poor AI.
Meanwhile, Sunday has been dubbed "Super Sunday" by the media, as the total TV audience for peak hours was the highest since January 2000.