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Little Mix were a pop band in the 21st century.
Bill Potts had a whole playlist on Spotify with songs by Little Mix. When Bill played one of the songs, Shireen told Bill they needed to talk about her taste in music. (TV: Knock Knock)
Behind the scenes
"Weird People", another song by Little Mix, plays throughout the opening scenes of the episode, where Bill and her mates are searching for a house to live in.