Slow Horses author shares a major update about the series' future after the surprise Season 7 renewal this week.

Hailed as “undoubtedly the best spy series on television", the Apple TV+ hit drama is adapted from Mick Herron’s best-selling books - and series 7 of Slow Horses is based on Herron’s Bad Actors, the eighth book in the award-winning Slough House series.

Of Down Cemetery Road, Herron said: "It stars Emma Thompson and Ruth Wilson. Morwenna Banks has written the series, and she's done a wonderful job. There's quite a lot of overlap in the teams that made Slow Horses and Down Cemetery Road, and what I've seen of it, which is only little bit, is looking absolutely tremendous."