For the unitiated, Channel 4's Black Mirror is a series of speculative fiction TV dramas created by Charlie Brooker, a twenty-first century Twilight Zone with stand-alone dramas inspired by the rise of digital media tech. Brooker has always been the ultimate hatchet-wielding reviewer - for this episode, satirical targets include friend-blocking, online pick-up gurus, and personal assistants such as Siri or Cortana.

However all the sci-fi concepts and subplots are a diversionary tactic. Brooker has used this episode to declare war on one primary target, and by the end of the episode you will hate it as much as he does. It is of course the soundtrack - Wizzard's "I Wish It Could Be Christmas Every Day."