Doctor Who: Before the Flood had an official consolidated rating of 6.05 million viewers.
The rating issued by the Broadcasters' Audience Research Board, or BARB, includes all those who watched the programme within one week of transmission. It does not include those watching online via iPlayer
Doctor Who was the 8th most watched programme on BBC Television, and second overall on Saturday. Full data is not yet available for ITV+1, but Doctor Who is expected to be around 21st for the week.
Top of the week was the final of The Great British Bake Off with 15.05 million watching, the biggest audience for any programme this year.