Since its 2022 debut, Apple TV+’s spy-thriller hit, Slow Horses, has transcended the typical espionage drama. Based on Mick Herron’s critically acclaimed Slough House novels, the series masterfully blends high-stakes action with deliciously dark humour, all centred around a motley crew of MI5 rejects—the titular ‘Slow Horses’—led by the brilliantly repulsive Jackson Lamb.
For the dedicated UK audience, the show isn’t just about the twist-laden plots; it’s a celebration of very British grit, wit, and a surprisingly sharp approach to covert fashion. With the series confirmed well into 2025 and beyond, let’s explore why this show is a cultural and style phenomenon, defining every season up to the current run and analysing the iconic looks that have defined the agents of Slough House.
1. The Full Dossier: Defining Every Slow Horses Season (Up to 2025)
The sprawling narrative of Slow Horses follows the ‘joes’ of Slough House as they stumble through major espionage crises, often to the profound embarrassment of their perfectly polished counterparts at MI5’s Regent’s Park (The Park).
Series 1 (2022): Slow Horses – The world is introduced to the disgraced River Cartwright and the noxious Jackson Lamb. Based on the first novel, the series tackles a shocking kidnapping plot, immediately setting the tone for low-glamour spy work and high-stakes tension.
Series 2 (2022): Dead Lions – The Slow Horses investigate a sleeper cell operating in the UK, linking a seemingly routine death to a dangerous Cold War relic. The season deepens the history of Slough House and the relationship between River and his troubled grandfather, David Cartwright.
Series 3 (2023): Real Tigers – The stakes become intensely personal when one of the slow horses is kidnapped, forcing the team to go rogue against ‘The Park’ and exposing deep corruption within MI5 itself. This season was a fan favourite for its explosive action and moral complexity.
Series 4 (2024): Spook Street – River’s past catches up with him as an old, highly sensitive MI5 secret threatens to dismantle the Service. The season explores themes of legacy and deception, with devastating consequences for the team.
Series 5 (Premiered 24th September 2025): London Rules – The focus shifts to tech wizard Roddy Ho, who becomes embroiled in a plot involving a glamorous new girlfriend and a series of bizarre, destabilising events across London. Lamb must quickly realise that “London Rules” should always apply in the world of espionage.
Series 6 (Confirmed for 2026): Joe Country – The team will be on the run, entangled in a high-stakes game of retaliation and revenge, hinting at a more fractured, desperate fight for survival.
Series 7 (Confirmed for 2026/2027): Bad Actors – An adaptation of the novel involving a politically charged thriller, showing that the dangers facing the Slow Horses are far from over.
2. The Most Talked-About Scenes: Lamb’s Wit and River’s Drive
While the entire cast is superb, two figures consistently dominate the cultural conversation: the slob king, Jackson Lamb, and the ambitious outcast, River Cartwright.
- Jackson Lamb’s Costume Defining Encounter: The Office Chair Monologue
Perhaps the most famous scene defining Jackson Lamb (Gary Oldman) is not an action sequence, but a cutting exchange in the dilapidated Slough House office. After a major blunder, Lamb slumps in his squeaky, eternally-farting office chair, delivering a brutal, hilarious monologue to a shell-shocked River. His dialogue is a masterclass in psychological warfare, a put-down so layered with cynicism and hidden intelligence that it instantly establishes his character: utterly repellent, yet undeniably brilliant. This scene is top-trending because it distils the show’s dark comedy and Lamb’s unique leadership style—he motivates by demoralising.
- River Cartwright’s Iconic Moment: The Training Exercise Revelation
River Cartwright’s (Jack Lowden) opening sequence in Series 1 remains his top-trending story arc. After a disastrous, high-profile ‘terrorist’ pursuit through London—which he believes he’s botched, costing lives—he’s exiled to Slough House. The gut-punch reveal that the entire incident was an elaborate, staged training exercise is a famous piece of spy-thriller storytelling. It perfectly encapsulates River’s drive, his competence, and the sheer ruthlessness of ‘The Park’, making the audience instantly sympathetic to the Slow Horses’ plight.
3. The Slough House Fashion Dossier: Top Trending Outfits
The contrasting wardrobe of Slough House vs. The Park is a key part of the show’s visual storytelling. Two outfits, in particular, have captured the imagination of UK viewers, cementing their status as fashion trends.
- Jackson Lamb’s Signature Trench Coat
The Outfit: A heavy, worn, and almost certainly uncleaned Grey/Brown Wool Trench Coat. It is oversized, permanently rumpled, and looks like it hasn’t seen a dry cleaner since the Cold War.
Why It’s Trending: It is the anti-spy uniform. In a world of sleek, tailored Bond-esque attire, Lamb’s coat screams neglect and disillusionment. The coat’s enduring appeal in UK fashion lies in its reflection of a current trend for ‘anti-fashion’ and relaxed, heritage outerwear. It symbolises a defiant indifference to authority and corporate polish, resonating with a desire for comfort and authenticity over sharp, restrictive tailoring. For fans, owning a ‘Lamb Coat’ is wearing a badge of cynical, yet resilient, British intelligence.
- Diana Taverner’s Polished Power Blazer
The Outfit: Diana Taverner Trench Coat (Kristin Scott Thomas), the Deputy Director-General of MI5, is consistently seen in an immaculate, often Navy or Burgundy, perfectly tailored Blazer and silk blouse ensemble. Her looks are always impeccable, modern, and high-end.
Why It’s Trending: Taverner’s style is pure, unadulterated ‘Quiet Luxury’ power dressing. Costume designer Guy Speranza deliberately dressed her in a feminine yet authoritative style—avoiding the expected ‘power suit’—to project strength without cliché. Her blazers and separates, often in rich, autumnal colours, have sparked a trend among professional UK consumers looking for a wardrobe that signifies authority, control, and elegance without being ostentatious. It’s the ultimate ‘boss’ uniform—a stark, stylish contrast to Lamb’s sloppiness.
FAQS for The Slow Horse Connoisseur and Jacket Collector
As interest in Slow Horses jackets and coats is rising so are the fashion related searches on Google. Here are the top questions and their answers:.
Q1: Where do I find a true to style Jackson Lamb trench coat?
A: As Lamb’s coat is unbranded and weathered the best bet is to go for an “oversized grey wool trench” or “heritage mac coat” from British heritage brands which include Burberry or Aquascutum, or for that authentic Slough House touch head to the vintage shops. Also look for a wool content and a loose, long fit.
Q2: Is the Slow Horses Slough House set in a real place in London?
A: Yes! The exterior of Slough House is at a real building on Aldersgate Street by Barbican station in London. This is also what gives the show its great deal of authenticity.
Q4: Why do I choose Express Jackets for my Slow Horses inspired outerwear?
A: As a fan which is into the series’ look from the worn in look of the Lamb to the more modern take of River Cartwright you want what is best. At Express Jackets we present you with expertly designed and made outerwear that is true to the show’s look. We put in the research to bring you pieces which are as durable as they are stylish, which will get better with wear and which embody the British spy style. We use premium fabrics and classic tailoring to bring you a little bit of the Slow Horses world you can wear anywhere.
Conclusion: Uk’s Long Running Spy Hit
Slow Horses is beyond just a spy series it is a dark sense of humor at play with issues of failure, redemption, and very British cynicism. From the genius in the tell telling of the story which plays out over seven seasons to the different fashion statements of Jackson Lamb and Diana Taverner the series is a dominant player in UK streaming and style. As the story continues to play out in its tough London setting the appeal of the Slow Horses look part polished Park, part shabby Slough House will certainly continue to be a trend in fashion.