Knock Knock overnight ratings
Knock Knock had an overnight viewing audience of 4.32 million viewers, a share of 24.9% of the total TV audience, according to unofficial figures.
Doctor Who has increased its audience by half a million from the previous week, no doubt helped by the appearance to David Suchet in the episodes as well as the lack of a bank holiday in the UK
Top for the day was once more the ITV variety show Britain’s Got Talent with 9.35 million viewers. Doctor Who was top for BBC One for the evening, with Pointless Celebrities getting 4.20 million watching, while Casualty managed 4.02 million.
SOURCE :: DOCTORWHONEWS