When does Black Mirror return?

There are 27 episodes in six series and one special, in addition to the interactive film Black Mirror: Bandersnatch (2018) The first two series aired on the British network Channel 4 in 2011 and 2013, as did the 2014 special "White Christmas" The series is inspired by The Twilight Zone and uses the themes of technology and media to comment on contemporary social issues. Black Mirror, along with American Horror Story and Inside No. 9, has been credited with reviving the anthology television format.
Black Mirror is an instance of speculative fiction within science fiction. The majority of episodes are set in dystopian near-futures with novel technologies that exaggerate a trait from contemporary culture, often the internet. Recurring themes throughout Black Mirror include data privacy and surveillance, virtual reality, individualism and consumerism. Some critics believed that episodes produced under Channel 4 had a more British tone or shared aesthetic qualities not found in later series.