Constitution Hill Faces His Biggest Flat Test Yet at Kempton

Few horses in British racing have generated the affection, fascination and debate that have followed Constitution Hill. At his peak over hurdles, Nicky Henderson's superstar looked almost unbeatable. His demolition of the Supreme Novices' Hurdle field at Cheltenham announced an extraordinary talent, and his subsequent Champion Hurdle victory confirmed him as one of the outstanding jumpers of the modern era.

Then everything changed. A horse once renowned for the effortless fluency of his jumping began making costly mistakes, and falls at Cheltenham, Aintree and Punchestown ultimately persuaded Henderson and owner Michael Buckley to try something radically different. Rather than continue over obstacles, Constitution Hill was switched to the Flat.

The result has been one of the most intriguing stories of the 2026 season. Two starts, two wins and now, after a five-month break, a first attempt at Group company. On Saturday he returns to Kempton for the Group 3 William Hill September Stakes, where Billy Loughnane takes over in the saddle and Constitution Hill faces by far the strongest opposition of his brief Flat career. For the first time, we should discover just how good a Flat horse he actually is.

From Champion Hurdler to Unbeaten Flat Horse

Constitution Hill's Flat career began at Southwell in February, with Oisin Murphy entrusted with introducing the nine-year-old to an entirely different discipline. He won, and while it was only a novice contest and nobody was pretending that beating ordinary Flat horses suddenly made him a Pattern performer, the important thing was how comfortably he adapted.

The experiment continued at Kempton in March, this time with Ryan Moore replacing Murphy, and again Constitution Hill won. That second success came over the same mile-and-a-half course and distance he tackles on Saturday and left him unbeaten after two Flat starts. He has not raced since, meaning the September Stakes represents a substantial escalation after 164 days away.

There is also an important reality beneath all the excitement. Constitution Hill is officially rated only 101 on the Flat, compared with Gethin on 117, Tornado Alert on 116, Pride Of Arras on 114 and Dubai Future on 113. On the figures, Constitution Hill should not win.

Henderson himself has been unusually forthright about that, describing Saturday as the race that will tell connections where they belong and stressing that his horse is being asked to compete against rivals with significantly stronger Flat form. That has not stopped the public backing him. Having been available at around 12-1 earlier in the week, Constitution Hill shortened dramatically following declarations and is now around 4-1, third favourite behind Gethin and Tornado Alert. The heart is clearly having some influence over the head.

Billy Loughnane Gets the Call

Another fascinating part of Saturday's story is the jockey, with Billy Loughnane becoming Constitution Hill's third different Flat rider in as many starts. Oisin Murphy rode him at Southwell and Ryan Moore took over at Kempton, but with Moore riding in America this weekend and Murphy booked to partner Tornado Alert, the opportunity has fallen to one of the brightest young jockeys in British racing.
Loughnane is still only 20 but has rapidly established himself among the country's
leading riders, and there can be few more interesting mounts available to him.

Constitution Hill is certainly not an inexperienced racehorse, but he remains
inexperienced at doing this. The tactical demands of a slowly run mile-and-a-half Flat race are completely different from those of a Champion Hurdle, particularly when the opposition contains horses capable of producing serious closing sectionals.

The encouraging part is that Constitution Hill has already shown at Kempton that he handles the track. Now Loughnane has to find out whether he can handle the company.

Gethin Is the Horse to Beat

For all the attention surrounding Constitution Hill, Gethin (Owen Burrows; Callum Rodriguez) is the rightful favourite at around 11-8 and sets a significantly higher standard on established Flat form.

Gethin is already a winner at Kempton and produced one of his best performances when finishing second to Ombudsman in the Brigadier Gerard Stakes earlier this season. His subsequent fifth in the Coral-Eclipse was disappointing, but there were mitigating circumstances and connections deliberately gave him time afterwards. He remains entered in both the Prix de l'Arc de Triomphe and Champion Stakes.

That puts Constitution Hill's task into perspective. He is not being asked to beat another promising novice, but a 117-rated four-year-old whose connections still harbour ambitions of competing in some of Europe's biggest middle-distance races. Gethin therefore provides the perfect measuring stick. If Constitution Hill can seriously challenge him, the Flat experiment moves into entirely different territory.

Tornado Alert and Pride Of Arras Add Serious Depth

Tornado Alert (Saeed bin Suroor; Oisin Murphy) is another formidable opponent and sits second in the market at around 7-2. The four-year-old is rated 116 and brings Group 1 form to Kempton, while there is also a nice subplot in the saddle. Murphy knows Constitution Hill particularly well having ridden him on his Flat debut, but this time he will be attempting to beat him.

Tornado Alert has the established speed and Pattern-race experience that Constitution Hill still has to prove he possesses. If the race develops into a proper test from some way out, that experience could be significant.

At around 5-1, Pride Of Arras (Ralph Beckett; Rossa Ryan) ensures the September Stakes is much more than a three-horse contest. Rated 114, he too possesses a substantial advantage over Constitution Hill on official figures and is a former Great Voltigeur winner who has already demonstrated that he belongs at Pattern level.

That is ultimately what makes Constitution Hill's participation so interesting. There are enough established Flat horses in the field that we should finally receive a meaningful answer.

Dubai Future Provides Another Benchmark

Constitution Hill will not even be the oldest horse in the race. That distinction belongs to ten-year-old Dubai Future (Saeed bin Suroor; Jack Mitchell), who continues to compete successfully at a remarkably high level.

Rated 113, Dubai Future has been competing internationally for years and remains capable of producing serious performances. He also has previous course-and-distance form and carries 9st 10lb, 3lb more than Constitution Hill and most of the field. At a bigger price he is not expected to win, but his presence provides another useful benchmark.

Warrant Holder (John & Thady Gosden; Benoit de la Sayette) is another potentially dangerous runner, while Almeric (Andrew Balding; Rob Hornby) completes the seven-runner field. There is nowhere for Constitution Hill to hide.

Melbourne Cup Dream Gives Saturday Extra Significance

What happens at Kempton could determine whether Constitution Hill's extraordinary story travels halfway around the world. He has been entered in the Melbourne Cup at Flemington on November 3, with owner Michael Buckley
particularly enthusiastic about the possibility of taking him to Australia.

But there is an important obstacle: Constitution Hill currently does not qualify. To take the next step towards Melbourne, he needs to finish in the first three on Saturday. Henderson has also explained that he probably needs his Flat rating to rise by another six or seven pounds to have a realistic chance of making the Melbourne Cup field.

That completely changes the context of this race. Victory would obviously be extraordinary, but Constitution Hill does not necessarily have to win for Saturday to be considered a major success. Finish in the first three against horses rated in the mid-to-high 110s and the Melbourne Cup dream remains alive. Finish outside the first three and Australia becomes considerably more difficult.

The Most Unlikely Reinvention in Racing

There is something wonderfully unconventional about the entire story. Constitution Hill was not an ordinary hurdler whose connections decided to have some fun on the Flat. At his best, he was one of the most dominant jump horses Britain has seen for years, winning his first eight races over obstacles and at one stage appearing capable of building a legacy alongside the great Champion Hurdlers.

His career then changed completely. The jumping errors arrived, his aura of invincibility disappeared and Henderson was left with an enormously talented horse for whom jumping itself had become the problem. The solution was almost absurdly simple: stop asking him to jump.

Southwell showed that the idea was viable. Kempton showed it was worth pursuing. Saturday tells us whether it can become something genuinely serious.

What Would Constitute Success?

This is perhaps the most important question surrounding Constitution Hill this weekend. The betting market increasingly believes he can win, but expectations should probably remain more measured.

He has 16lb to find with Gethin, 15lb with Tornado Alert, 13lb with Pride Of Arras and 12lb with Dubai Future on official Flat ratings. Those are enormous gaps, but Constitution Hill's rating is based on just two relatively uncompetitive novice races. Nobody truly knows where his ceiling lies because he has never yet been required to show it.

If he finishes fifth after being outpaced by established Group horses, the experiment has still produced two wins and an entertaining new chapter in a remarkable career. If he finishes third and proves competitive, Australia remains alive. If he wins, the entire conversation changes. Suddenly Constitution Hill is not a Champion Hurdler having an interesting second career, but a legitimate Group-class Flat horse. At nine years old, that would be some story.

The Verdict

The formbook points firmly towards Gethin. His second behind Ombudsman is the strongest piece of relevant form in the race and, if Owen Burrows has him back to his best following the Eclipse, he deserves his position at the head of the market. Tornado Alert is the obvious danger and Pride Of Arras has to be respected.

But Constitution Hill is the reason everyone will be watching. His price has shortened significantly, perhaps partly because of affection and reputation rather than anything he has actually achieved on the Flat, and backing a 101-rated nine-year-old at around 4-1 against horses rated as high as 117 requires a considerable leap of faith.

Yet Constitution Hill has spent much of his career making apparently difficult things look remarkably straightforward. Saturday is different. For the first time since his switch to the Flat, he is not being given a race to win. He is being given a race to tell us how good he is.