Doctor Who - The Lie Of The Land had an official rating of 4.82 million viewers.
The episode, which was shown against the final of Britain's Got Talent, managed to slip into the top 30 programmes of the week. thanks to viewers who recorded the programme and watched it within a week of transmission.
The official rating is the first time Doctor Who has dropped below 5 million viewers since the series returned in 2005.
Doctor Who was the 9th most watched programme on BBC Television for the week, and the 2nd most watched programme on television on Saturday night.
The week was dominated by the ITV talent show, with the various heats, shown throughout the week, dominating the chart. Britain's Got Talent, however, didn't take the top spot. That was achieved by the concert One Love Manchester, held to honour and raise money for the victims of the Manchester terrorist attack, which had 11.63 million watching.