In Black Mirror, Irma Thomas's song 'Anyone Who Knows What Love Is' got featured a lot:
In Fifteen Million Merits: Abi sings "Anyone Who Knows What Love Is" for the judges.
In White Christmas, song is used in a karaoke segment.
In Men Against Fire, Hunter sings this song in Heidekker's farmhouse while holding him at gunpoint.
But why is this real life song used so prominently? Is there any significance of the song to Black Mirror theme?