As of October 2025, the TV series "Slow Horses" has five released series. The first four series adapted the first four novels in Mick Herron's Slough House series: "Slow Horses," "Dead Lions," "Real Tigers," and "Spook Street." The fifth series, which premiered on September 24, 2025, is based on the fifth book, "London Rules." Additionally, the series has been renewed for a sixth and seventh series, which will be based on the novels "Joe Country" and "Slough House" (series 6), and "Bad Actors" (series 7), respectively. This means a total of seven series are planned for the "Slow Horses" TV adaptation, with five available to watch as of now and two more confirmed for the future.