It’s also been announced that the company’s chief executive, Dido Harding, is to leave the telecoms group in May after seven years.
Baroness Harding will be replaced by managing director Tristia Harrison, while founder Sir Charles Dunstone will take a more active role in the company as executive chairman.
Revenues for the quarter ending December 31, 2016 fell to £435 million from £459 million in the same period in 2015.
In addition to the losses in its YouView powered TV service, there were also net decreases in “on-net” customers, while mobile and fibre grew.
Last October, TalkTalk received a record £400,000 fine from The Information Commissioner’s Office for a failing in website security that led to a theft of customer data.