John Simm was once offered the chance to sign on for a third season, but he declined. He later regretted that decision. In an interview in September 2018, he said that if this show would ever be revived in some way, he would love to play Sam Tyler again.
The character name Superintendent Frank Morgan in later episodes of Season 2 was a tribute to 1970s police series The Sweeney (1975) in which Superintendent Frank Haskins was played by actor Garfield Morgan. Also, Frank Morgan was the actor who played the Wizard in The Wizard of Oz (1939).
In an interview with the Daily Mail in July 2020, Dean Andrews revealed that the creators are working on a third season. Matthew Graham later revealed that the third season would take place in the 1970s, the 1980s and an alternate present. The project was in development under the working title "Lazarus", named after a song from David Bowie's final album. However, in June 2023, the creators have announced that the show is not moving forward, citing financial rather than creative difficulties.
Following the conclusion of filming the second and final series, the Ford Cortina was auctioned on eBay to raise money for Comic Relief.