Britain's first women police constables were employed in 1915; an important example of women showing they were capable of doing previously exclusive "men's work" during the First World War and not standing down afterwards.
Although the actual events occurred in Littlehampton, the filming did not take place there. Instead nearby Arundel and Worthing were used. Arundel was used for town and street events. All the seaside filming was carried out in Worthing.
In the movie Rose Gooding is Irish migrant. In real-life she was born in Lewes, Sussex, England. Jessie Buckley, who plays Rose, was born in Killarney, Ireland.
In the movie some characters (Gladys Moss, Bill and Judge Maccleston) are played respectively by the non-white actors and actresses Anjana Vasan, Malachi Kirby and Cyril Nri. In real-life Moss, Bill and Judge Maccleston were white.
Reunites Olivia Colman and Jessie Buckley, who starred together The Lost Daughter (2021), playing the same character at different ages.