Journey to the Centre of the TARDIS had an Appreciation Index, or AI score, of 85.
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. The highest scoring programmes of the day were Casualty with 87, Dad's Army with 88 and Law and Order with 89.