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.
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.
Continual references are made to O Mágico de Oz (1939). In episode 1.1, Tyler leaves the station with the intention of walking back to reality. He says to Cartwright that he is going to 'follow the Yellow Brick Road'. In episode 1.2, after the principal drama has resolved, Tyler suggests to Hunt that he transfers him back to the division he came from. Hunt obliges, picking up his phone and saying that 'the Wizard will sort it out because of the wonderful things he does'. Throughout the series Hunt insultingly refers to Tyler as 'Dorothy'. In episode 2.2, Elton John's song 'Goodbye Yellow Brick Road' can be heard in the soundtrack while in the final episode (2.8), the song 'Over The Rainbow' can be heard in the soundtrack.