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