The score is a measure of how much the audience enjoyed the episode. It is based of a survey of 5000 people. The score of 88 puts the programme into the excellent category.
Doctor Who was the joint highest scorer on the two main channels for the day, along with Casualty, which we know consistently achieves high scores.
The mid-series finale currently stands at 21st in the list of top programmes for the week. Final figures will be released next week.