It has been revealed that Doctor Who Series 6 Episode 4 achieved an AI Figure (Appreciation Index) of 87.
The score was the second highest for Saturday night, with only The Comedy Genius of John Sullivan on BBC Two scoring higher.
The Appreciation Index, or AI is a measure of how much the audience enjoyed the programme. It is a score out of 100 based on responses from a 5,000 strong panel. A score above 85 is considered excellent.
[Source: The Doctor Who News Page]