Slow Horses Season 5 review – London rules, broken

🐴 Introduction

🐴 This review is part of our Slow Horses hub — every season reviewed and ranked, plus why the show works so well and what is coming in Season 6.

Every long-running show eventually reaches the season where you can see the machinery. London Rules is that season, and the remarkable thing is that it is still very good.

It does not start that way. The opening of the first episode, “Bad Dates”, is the most brutal thing the series has ever done. A man finishes his breakfast, walks down to a van, takes out an assault rifle and opens fire on a busy square. Then a sniper kills him, and the van drives away. No score, no build, no reaction shot to guide you. It is over in about two minutes and it is genuinely difficult to watch, because it is staged as an ordinary morning rather than as a set piece.

That is the show at full strength: the refusal to make horror cinematic. What follows is a season that never quite matches it — and which makes a decision so counterintuitive that it deserves credit even where it does not entirely work. It gives the plot to Roddy Ho.

🧠 Story & themes

Roddy Ho has been the show’s running joke for four seasons. A hacker of real ability and no self-awareness whatsoever, convinced he is the most dangerous man in the building, incapable of reading a room. Christopher Chung has played him beautifully, and the character has never once been the point of an episode.

Season 5 opens with somebody trying to kill him.

The thread that follows is a good one. Roddy has acquired a girlfriend, Tara, who is glamorous, attentive and entirely inexplicable to everyone who knows him. The only person in Slough House who does not find this suspicious is Roddy. Working out why somebody has gone to the trouble of manufacturing a relationship with the least significant person in British intelligence is the season’s best question, and the answer opens onto a destabilisation campaign running through public life: a mayoral race, coordinated attacks, and a strategy that depends on how little it now costs to make a country frightened of itself.

The theme is the manufacture of chaos. Where Season 2 dealt with old ideological enemies and Season 4 with private, personal monstrosity, Season 5 is about disruption as a product. Nobody in it wants to conquer anything. They want the machinery of a functioning society to seize up, because a seized-up society is easier to sell things to.

It is a sharp idea, and the season articulates it well. Where it falls short is in making you believe the plan would actually work. Herron’s novel gets away with more because the prose is openly satirical; on screen, the plot asks for a chain of coincidences that the show’s own realism keeps drawing attention to.

🎭 Characters & performances

Christopher Chung is the reason to watch this season. Handed real material for the first time, he plays Roddy’s humiliation without ever making him pitiable, and finds the frightened, isolated person under four seasons of preening. There is a scene late on where Roddy has to be told something plainly, by somebody who is not being unkind about it, and Chung plays it with a stillness the character has never had.

Aimee-Ffion Edwards benefits too. Shirley Dander saving Roddy’s life in the first episode sets up a partnership between the two most volatile people in the building, and Edwards continues to be the show’s most reliable source of unpredictable energy.

Nick Mohammed, as the mayoral candidate Zafar Jaffrey, is a clever piece of casting. Best known for comedy, he plays a politician who is genuinely decent and genuinely ambitious and cannot always tell which one is driving him. It is a quietly good performance in a role that could have been a plot function.

Around them, the regulars do what they do. Oldman is unimprovable and, by now, unsurprising, which is the season’s real problem: a fifth serving of Lamb being disgusting and correct is still enormously enjoyable and no longer reveals anything. Kristin Scott Thomas, James Callis and Ruth Bradley keep the Regent’s Park politics ticking, though the season gives Emma Flyte less to do than Season 4 promised.

🎬 Craft: Still the best-made show in its genre

Saul Metzstein, who directed Season 3, returns for all six episodes and brings back some of that season’s forward momentum. The London material is excellent — this is a season that uses ordinary public space as its threat surface, and it understands that a shopping street in daylight is more unsettling than a warehouse at night.

The show’s craft standards have not slipped, which the awards record reflects: Season 5 drew nine Primetime Emmy nominations at the 2026 awards, including Outstanding Drama Series, with Gary Oldman nominated for Lead Actor and Jack Lowden for Supporting Actor. On a scene-by-scene basis this is still among the best-made drama on television.

The problem is structural rather than technical. The season carries three plots — Roddy’s, the political campaign, and the Regent’s Park manoeuvring — and it never fully braids them. Season 3 had the same number of threads and pulled them into a single knot for the finale. Season 5 resolves them adjacent to each other, and the ending is competent rather than inevitable. It is the first Slow Horses finale you could describe as tidy.

👨‍👧 The dad perspective

Six episodes, roughly 45 minutes each, unchanged, and the format remains the most respectful use of a weeknight in streaming. If you are five seasons in, none of this is a decision you are still making.

If you are not, this is the wrong entry point, and not only for continuity reasons. Season 5 is written for people who have spent four years with these characters — the Roddy material only works because you have four seasons of contempt for him to reconsider.

Age guidance: 16 and up, and be deliberate about this one. The opening mass shooting is the most upsetting sequence in the series, and it is presented without any of the framing devices that normally let you keep your distance. If that subject is difficult in your house, skip this season rather than fast-forwarding two minutes.

Rewatch value: the lowest of the five, which is a comparative judgement rather than a criticism. The pleasure here is in watching a character you had written off get taken seriously, and that only really lands once. On an Apple TV 4K the daylight London photography looks superb, for whatever comfort that is worth given what happens in it.

✅ Pros & cons

Waiting for the next season to land? Prime Video’s 30-day free trial covers a gap week or two — check the catalogue on the day rather than assuming anything specific is on it.

Is Slow Horses Season 5 the weakest season?

For us, yes, though that is a high bar. We rate it 4 out of 5 against 4.5 for Seasons 2, 3 and 4 and a perfect 5 for Season 1. The performances and dialogue are as good as ever; the conspiracy driving it is the least convincing the show has built.

Which book is Slow Horses Season 5 based on?

London Rules, the fifth Slough House novel by Mick Herron, published in 2018. It is the most overtly satirical book in the series, and the adaptation keeps the plot while softening some of the political bite.

Did Slow Horses Season 5 get Emmy nominations?

Yes. Season 5 drew nine Primetime Emmy nominations at the 2026 awards, including Outstanding Drama Series, Lead Actor in a Drama Series for Gary Oldman and Supporting Actor for Jack Lowden. The ceremony is scheduled for 14 September 2026.

Is Slow Horses Season 5 too violent?

It opens with a mass shooting in a public square, staged with the series’ usual refusal to soften anything. We would put this season at 16 and up, and would not put it on if that subject matter is likely to land badly.

How many episodes is Slow Horses Season 5?

Six episodes, released weekly on Apple TV from 24 September to 29 October 2025, each running around 45 minutes.