Nicky Henderson expects a second blood test on Monday to be the “acid test” in Constitution Hill’s race against time to be fit for the Cheltenham Festival.

The unbeaten and defending Champion Hurdle hero worked poorly at Kempton Park on Tuesday, putting his participation at the showpiece meeting in major doubt.

A scope showed mucus in his lungs and despite slightly more positive news in the following days, results of a blood test on Thursday proved to be another blow.

In a statement issued on X on Friday, Henderson revealed the results of a second scope were more encouraging, but admits his stable star is still “unwell” with his intended return to action in the Cotswolds a little over a week away.

Henderson said: “On what was about as foul and filthy morning as you can imagine at Seven Barrows, Constitution Hill had a light exercise and was rescoped afterwards as planned. This showed the Neutrophil percentage, indicative of infection, was back to normal parameters with no mucus evident.

“This is obviously positive news but we cannot hide behind yesterday’s blood test which basically reveals that, in simple terms, our horse is ‘unwell’.

“He will have a quiet weekend and we propose, as originally planned, to take a further blood test on Monday which I believe will be the acid test. Therefore I think we might leave it until then to keep everybody updated on the situation.”

Nicky Henderson is not giving up hope of Constitution Hill being able to defend his Unibet Champion Hurdle crown and will have his unbeaten superstar “rescoped” again on Friday, after a below-par workout at Kempton Park on Tuesday put his participation in doubt.

As has become tradition, Henderson took several of his Festival contenders for a spin at the Sunbury circuit, including Constitution Hill, whose only start this season was in the Christmas Hurdle at Kempton on Boxing Day.

Bookmakers were quick to suspend the betting markets in the wake of the work, and the Seven Barrows trainer told the PA news agency his superstar had scoped badly following it.

“Unfortunately, in a routine gallop this morning, Constitution Hill was very disappointing and it transpires, after the vet has scoped him, that there is evidence of mucus,” said Henderson.

“We’re taking a sample of it to a laboratory to analyse it, which will tell us about the significance of it and we should know more after that.

“Last week, he worked brilliantly and he was scoped 10 days ago, but these things happen, just like it did with him earlier in the year (having to miss Cheltenham on Trials day in January).

“Horses are like humans, look how many people had the awful cough around Christmas that took ages to get rid of.”

He went on: “The vets still think it could clear up in a week and all his serious work has been done already, whether he makes it (to Cheltenham) will depend on the severity of it.

“He was disappointing this morning working with Sir Gino (Triumph Hurdle favourite), who he has worked with in the past. He would normally go easily with him, but this morning he couldn’t, so Nico (de Boinville) realised all was not well and wasn’t hard on him.

“Obviously, the mucus was affecting him. He’s not coughing, he’s just got a dirty picture, as we say.

“I’m not saying definitely either way (about Cheltenham) and I’ll keep hoping. As you can imagine, it has come as a bit of a shock.”

Giving an update later on his X (formerly Twitter) account, Henderson said: “Following up on this morning’s situation with Constitution Hill, the sample from his tracheal wash has shown a small increase in the number of neutrophils which indicates a respiratory infection, which is significant but far from drastic.

“He will start a course of antibiotics immediately and we plan to rescope him on Friday in order to monitor which way this is going. He would only be having light exercise this week following this morning’s racecourse gallop.

“Both our own vet and the racecourse veterinary surgeon who scoped him feel we definitely have a chance of correcting this in time and we will be doing everything possible to do so. We have a fortnight to work him and it is possible, so we will keep everybody notified accordingly.

“He is absolutely fine within himself and we have simply got to get on top of this issue as quickly as possible.”

Having been the 1-4 favourite for the Champion Hurdle at the start of the day, by the afternoon Constitution Hill was significantly bigger at 5-4 with the sponsors, who make the Willie Mullins-trained State Man their 4-5 favourite. In their non-runner, money back betting market, Coral make State Man 4-7 and Constitution Hill 4-6.

Constitution Hill sent shockwaves through the Unibet Champion Hurdle market on Tuesday morning, with the participation of the reigning champion seemingly in doubt following a below-par workout in a pre-Cheltenham visit to Kempton Park.

As has become tradition, Nicky Henderson took several of his Festival contenders for a spin at the Sunbury circuit, including the unbeaten Constitution Hill, whose only start this season was in the Christmas Hurdle at Kempton on Boxing Day.

Bookmakers were quick to suspend betting in the wake of the work, and the Seven Barrows trainer told the PA news agency his superstar had since scoped badly.

“Unfortunately, in a routine gallop this morning, Constitution Hill was very disappointing and it transpires, after the vet has scoped him, that there is evidence of mucus,” said Henderson.

“We’re taking a sample of it to a laboratory to analyse it, which will tell us about the significance of it and we should know more after that.

“Last week, he worked brilliantly and he was scoped 10 days ago, but these things happen, just like it did with him earlier in the year (having to miss Cheltenham on Trials day in January).

“Horses are like humans, look how many people had the awful cough around Christmas that took ages to get rid of.”

Former trainer Keith Reveley has spoken of his immense pride after seeing son James belatedly break his Grade One duck in Britain aboard the hugely impressive Il Est Francais at Kempton Park on Boxing Day.

The Reveley name is, of course, steeped in northern jumps racing history, with Keith’s late mother Mary a pioneering female trainer who saddled more than 2,000 winners during an illustrious career.

Son Keith later took over the reins at the family’s Saltburn base before calling it a day himself in 2017, while James Reveley has gone on to establish himself as a leading jockey in France.

It is eight years since the proud Yorkshireman took the Gallic plunge and it could hardly have worked out better, as he has been crowned French champion jumps jockey on three occasions and won a whole host of major prizes, including a hat-trick in the prestigious Grand Steeple-Chase de Paris.

His father is delighted with his son’s achievements across the Channel, but admits it was extra special to see the Reveley name back in the big-race winner’s enclosure on home soil after Il Est Francais, jointly trained by another French-based Englishman in Noel George, produced a scintillating display in the Kauto Star Novices’ Chase.

“It was a great day and what made it even better was we managed to go, as we were en route to France to see the grandchildren and called in at Kempton on the way, so it was absolutely brilliant,” he said.

“The style with which the horse did it took me back to the old days, as James always rode well from the front. I remember him riding a horse called Night In Milan for me, who used to make the running and jump for fun around Doncaster.

“Funnily enough, we walked the track together an hour before the race at Kempton and for once everything worked out as we’d hoped. I said to him ‘Harry Cobden always likes to go a bit wide, so you should be able to get a nice run down the inside and it’s all about rhythm and jumping’.

“I said ‘make sure you give him a breather round this last corner, don’t press him the whole way’, and I honestly couldn’t believe how well everything was working out just as we’d spoken about, as it not very often does.”

Keith Reveley himself landed the Kauto Star Novices’ Chase – then the Feltham – with the Mick Fitzgerald-ridden Ungaro in 2006, while James partnered the stable’s Tazbar to finish second to the brilliant Long Run three years later.

In Il Est Francais, though, Keith feels his son has come across the horse of a lifetime.

He added: “The Feltham was the only Grade One I actually won as a trainer, so it was a magical day to see James win it and we just pray the horse stays in one piece. Hopefully he won’t need to start training just yet, as long as that horse is still around!

“He’s an exceptional horse. I’ve actually been to Noel’s to see him work in a morning and he’s the most gorgeous horse to look at.”

Connections have already nominated the Grand Steeple-Chase de Paris as Il Est Francais’ first major target for this year, with a return to Kempton for the King George also high on his agenda.

Should he come through both of those assignments unscathed, then a tilt at the Cheltenham Gold Cup may loom large in 2025, although Reveley senior does have some reservations about the suitability of that particular test.

“I must admit I think the Kempton track suits him, as the horse has got loads of natural pace, and whether he wants three and a quarter miles around Cheltenham is another thing,” he went on.

“I know he’s won around Auteuil on soft ground, but they go much slower early on in the races there and whether he’ll suit the slog of Cheltenham, we’ll have to wait and see.

“James is adamant he will suit the Grand Steep – because the pace is quite relaxed early on over there, he’s confident that the trip won’t be a problem for him, but off a flat-out pace over three and a quarter miles at Cheltenham, it’s a different ball game altogether.”

While Reveley certainly does not begrudge his son’s success, he admits he had initially harboured hopes he would continue to ride in Britain at least part-time to aid his own career before the lure of French riches proved too much for him to resist.

“He used to stay with me for the winter and then go back to France every April time and stay there for the summer,” he recalled.

“I always thought it was working well, as he’d usually get maybe 50 winners in England during the winter and I thought he had a good career, but the French people kept saying if he went full-time he’d be champion and, as it turned out, the first year he went there full-time, he was champion, so it worked out.

“I wouldn’t say it was devastating for me because I’m proud he’s done so well, but it more or less put paid to my training career because it’s a hard enough job as it is without your son moving away.

“To be fair, I think the French racing suits him because he’s always been a good horseman over a jump and obviously in France, you’ve got the bullfinch fences and different types of obstacles.

“In English races, they go very fast early on and it’s a little bit of a war of attrition, whereas the French tend to be a little more tactical and rely on the jumping a little bit more. It’s worked out very well, he’s had a great time and hopefully he has a few more years at it yet.

“It was nice to see him do it on English television at Kempton. I’ve had a lot of people commenting how good it was to see him winning over here and how it’s nice to see he’s still got his northern accent!”