When does Slow Horses return?

Slow Horses is a spy thriller television series based on the Slough House novels by Mick Herron. The series premiered on Apple TV+ on 1 April 2022. Season two premiered on December 2, 2022. In June 2022, the series was renewed for third and fourth seasons.
Slough House is an administrative purgatory for MI5 service rejects who have bungled their job. Those consigned there are known as "Slow Horses" They are expected to endure dull, paper-pushing tasks, along with occasional mental abuse from their miserable boss, Jackson Lamb.