Doctor Who - 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 increased its audience by half a million from the previous week.
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.
