Harry Derham has been building one of the more exciting small training operations in British jump racing since taking out his licence in 2022. His stable has been running at 31% from 16 runners over the past fortnight — a figure that places him among the most in-form trainers in the country right now — and today he sends Casual Observer to Hexham for the 16:41 in what looks a well-chosen assignment for a horse the form book explicitly describes as "open to improvement over fences." That combination of yard confidence and unexplored ceiling is the foundation of today's NAP.
The Selection
Casual Observer is a seven-year-old gelding trained by Harry Derham at Upper Lambourn in Berkshire, partnered by Paul O'Brien in the Weatherbys Handicap Chase over 2m4f15y on good ground at Hexham. He carries an OR of 112, RPR of 118, and TS of 65 — the latter reflecting the nature of a horse who has had only one chase start to draw upon. His form figures read 5-/-5-1---2, with the hurdles record including a Ffos Las win in February 2025 and the chase sequence showing an encouraging debut second at Bangor last month.
Form and Class
The hurdles background matters here more than the single chase run suggests. Casual Observer won at Ffos Las over 2m4f on heavy in February 2025 under Paul O'Brien — the same jockey who rides today — and the year's gap before his chase debut was patience from a yard that places horses deliberately rather than rushing them. When he eventually appeared over fences at Bangor on February 25th, he went off at 13/8 in a four-runner field. The Racing Post's pre-race note had been clear: "has the potential to be well handicapped on his chase debut."
The Bangor run itself is the key piece to read carefully. On soft-heavy ground — the going stick showed the chase course at 2.7, which is as testing as conditions get — he was "restrained in last but well in touch, made headway to go third before two out, ridden and went second approaching the last, kept on one pace, no match for the winner." That is the running style of a horse who is still learning rather than one who was simply outclassed. He was never jumping with full confidence but made steady progress through the field and was beaten 8.5 lengths by Bowenspark, who won readily. The expert view's framing is the crucial read: "albeit no match for the winner" — with the implicit observation that the heavy ground at Bangor was an extenuating factor, not an indictment of his ability.
Today's good ground at Hexham is materially different from what he faced at Bangor. His hurdle win came on heavy, but a horse whose action improves on better ground — and the expert view's implication that the conditions "could play a leading role" is specifically conditioned on the forecast good — finds today a more natural test. The step from a four-runner debut on extreme ground to a competitive handicap on good ground is exactly the scenario where improvement is most likely to manifest.
Why Today
Harry Derham described his horses as "running really well all season" in a recent stable tour, and the 31% strike rate from recent runners confirms it. Paul O'Brien has ridden this horse throughout his hurdling career and on his chase debut — the continuity of that partnership at a track like Hexham, where rider familiarity with a still-learning chaser matters, is a genuine positive. The expert view's conclusion — "could play a leading role" — sits within the context of a horse who has shown enough on his one chase start to justify confidence stepping up in trip slightly on better ground.
The Opposition
At 2.75, Casual Observer opens as a market favourite in what appears to be a competitive handicap at Class 4 level. The opposition will include rivals with more chase experience, and any horse with proven Hexham form deserves respect given the track's unique demands — an undulating, left-handed course in Northumberland where jumping and stamina matter more than flat-track pace. The honest caveat here is that one chase start is a limited evidence base, and the improvement angle depends on today being the occasion where the learning curve steepens in a positive direction. That is the risk — but it is offset by a 31% yard, a consistent jockey partnership, and ground conditions the expert view regards as genuinely more suitable.
The Bottom Line
Won at Ffos Las over hurdles in testing conditions. Encouraging chase debut second at Bangor on soft-heavy — kept on having made ground through the field. Good ground today better suits per expert view. Open to improvement over fences — only one chase start behind him. Harry Derham yard at 31%. Paul O'Brien retained. Expert view: "could play a leading role." At 2.75, this is today's NAP — an unexposed improver from a yard in form, on ground that suits better than what he faced on debut.
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