 
<translate> Muhimmin bangare don amsa wannan tambayar shine: Jerin ya faru ne a wani canji na karni na 21 a Biritaniya. Saboda haka, amsar tana cikin wata Biritaniya ta ƙarni na 21. <eng> The important part for answering this question is: The series takes place in an alternate 21st-century Britain.
Therefore, the answer is in an alternate 21st - century Britain. 