Flux: Chapter Three: Once, Upon Time achieved an Audience Appreciation Index score of 75.
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.
Range-wise, a figure of 60 is considered poor with 85 as excellent, so in context 75 sits firmly between those two views; however it is the lowest received by the series since its return in 2005.
The average for Flux at its halfway point is 76.