Doctor Who: The Bells of St. John - Appreciation Index

The Bells of Saint John had an Appreciation Index, or AI score, of 87.

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.

Doctor Who scored higher than most of Saturday's output. Other high scoring programmes were Casulty with 87, Richard Briers: A Tribute with 88 and Easter From Kings with 89.

via Doctor Who News