For those who haven't yet dived into the world of Slow Horses, either in literary form or on screen, the series follows a group of MI5 rejects who have messed up to such an extent that they have been sent to do admin in the dumping ground of Slough House.

Season 5 will feature an adaptation of London Rules, the fifth book in the best-selling novel series by author Mick Herron, with the plot following the lesser-spotted tech nerd Roddy Ho ( Christopher Chung) in an exciting narrative shift.

Slow Horses author Mick Herron and showrunner Will Smith on the show's evolution and how Season 5 "comments on contemporary British politics."