In season five, everyone is suspicious when resident tech nerd Roddy Ho has a glamorous new girlfriend, but when a series of increasingly bizarre events occur across the city, it falls to the Slow Horses to work out how everything is connected. After all, Lamb knows that in the world of espionage, "London Rules" should always apply.

In season three, Jackson Lamb's disgraced spies work together to foil a rogue agent when one of their own is kidnapped.