Christmas Day TV ratings in the UK fell to their lowest recorded level

"Christmas Day TV audiences on December 25th 2016 were at their lowest level since records began in 1981.
BBC1 period drama Call the Midwife was the most-watched programme attracting an audience of 9.2 million. BBC1 had eight of the 10 most-watched programmes overall on Christmas Day, while ITV had two.
Audiences for Christmas Day – which traditionally attracts big audiences – have been falling in recent years with the introduction of catch-up and on-demand services. No programme has attracted more than 20 million viewers since 2001, and the figure of 15 million has not been achieved since 2008. 2016 marked the first time no programme attracted an audience of 10 million."

Source - Advanced Television, using data from BARB, 5th January 2017