Doctor Who: The Witch’s Familiar had an Appreciation Index (AI) of 83.
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 score of 83 is in line with the average for Series 8, but counts as a slight drop on last week’s score of 84.
[Source: Doctor Who News]