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Horse profile

Lady Diesel (GB)

3yo filly (at last run, Sep 2025) · Last trainer Fergal O'Brien · Last owner The Milk Sheiks
by Sergei Prokofiev (CAN) out of Midnightly (GB) (Acclamation)
10 runs · 9 courses · from Aug 2024
As at 5 Nov 2026 · KTB archive: GB, Ireland & France · 2005–present, updated daily
No run recorded since 22 Sep 2025 — 408 days ago. Our archive can't say whether the horse is still in training.
Last run Sep 2025 · 9th of 10 Last raced off OR 45
KTB Profile

Lady Diesel (GB) is yet to win from 10 starts and has never placed. She raced over 6f to 7f on eight occasions and over 1m to 1m1f on two others, with five runs on turf and five on all-weather. Typically held up, she finished 9 of 10 at Wolverhampton (AW) in Sep 2025 in a Class 6 handicap, last raced off OR 45 which was 15lb below her highest ever mark. Aged 3 at her last run in Sep 2025.

Based on 10 archived runs · run-style from 10 commented runs since Aug 2024 · updated 5 Nov 2026
KTB at a glance Typically held up OR ↓ 15lb off peak
Official rating45↓ 15lb off peak
45 45–60

KTB Speed and Rating

KTB Speed

Best recent Speed 85 the best of the last 3 graded (A or B) runs · Bath, 13 Sep 2025

How fast the horse ran, as points against the day-corrected standard time for its course and distance: 100 is the median GB Class 4 handicap winner on that code; one point is 0.1% of the standard time. A, B or C is how much the day's card could tell us, not how good the run was. What this means →

Flat 10 figures · best 92C · median 73.5
GoingRunsBestMedianSince 5 Nov 2025
Standard (AW)590A68—
Good to Soft292C88.5—
Good to Firm277C71.5—
Good1———
DistanceRunsBestMedianSince 5 Nov 2025
6f – 7f892C69—
1m – 1m1f290A87.5—

KTB Speed v1 · batch 15 Sep 2026 · GB & Irish racing only · 10 figures from 10 runs · as at 3 Oct 2026 · a record, not a forecast

KTB Rating

Best recent KTB Rating 47A the best of the last 3 rated runs · Lingfield, 22 Jul 2025 Official rating 45 at the last run, 22 Sep 2025

What the horse achieved in each race, in pounds on the official-rating scale, from the weight carried, the lengths beaten and the race's own level solved across the archive — never the market, never the official rating as a starting point. The headline is the best of the horse's last three rated runs on that code — its best recent day. The KTB Rating on a racecard is a different reading of the same figures: the level the horse has been running to, an average of up to its last six runs with the latest counting most, so the two can differ. A, B or C on a run is how much known form was in that race. What this means →

Flat 10 figures · best 59A · median 49.5
GoingRunsBestMedianSince 5 Nov 2025
Standard (AW)559A52—
Good to Soft247A46.5—
Good to Firm253A52.5—
Good1———
DistanceRunsBestMedianSince 5 Nov 2025
6f – 7f853A49.5—
1m – 1m1f259A52.5—

KTB Rating v1 · batch 3 Oct 2026 · GB & Irish racing only · 10 figures from 10 runs · as at 4 Oct 2026 · a record, not a forecast

Both figures are KTB's own, computed from the archive; no vendor rating enters either. Every run's figure is on its form line below with its grade. Grades measure how much the archive could see, never the merit of the run.

Run style from 10 analysed runs since Aug 2024

  • Held up 8 (80%) · 0 wins
  • Prominent 1 (10%) · 0 wins
  • Mid-division 1 (10%) · 0 wins

Pedigree intelligence

Sire
Sergei Prokofiev (CAN)

Progeny in our archive have won 10.5% of 1,375 runs since Mar 2024 (203 horses).

GoingRunsWinsSRvs sireThis horse
Firm12433.3%+22.8—
Good to Firm261218%−2.50 from 2
Good303289.2%−1.30 from 1
Good to Soft1131311.5%+10 from 2
Soft1021211.8%+1.3—
Heavy29517.2%+6.7—
Standard (AW)5556111%+0.50 from 5
Distance (all codes)RunsWinsSRvs sireThis horse
Under 6f2463213%+2.5—
6f – 7f8378510.2%−0.30 from 8
1m – 1m1f2302410.4%−0.10 from 2
1m2f – 1m4f5535.5%−5—
1m5f – 2m400%−10.5—
2m1f – 2m4f300%−10.5—

Flat and jumps together (all codes) · since Mar 2024 · as at 5 Nov 2026 · rows under 30 runs muted · win % is the measure, a record not a forecast

Dam
Midnightly (GB) (Acclamation)

No other produce in our archive. It holds racing in Great Britain, Ireland and France from 2005, so siblings racing elsewhere won’t appear here.

Record by conditions

GoingRunsWinsSR£1
Standard (AW) 5 0 0% −5.00
Good to Soft 2 0 0% −2.00
Good to Firm 2 0 0% −2.00
Good 1 0 0% −1.00

ClassRunsWinsSR£1
Class 6 7 0 0% −7.00
Class 5 1 0 0% −1.00
Class 2 1 0 0% −1.00
Class 4 1 0 0% −1.00

CourseRunsWinsSR£1
Kempton (AW) 2 0 0% −2.00
Wolverhampton (AW) 1 0 0% −1.00
Bath 1 0 0% −1.00
Lingfield 1 0 0% −1.00
Ripon 1 0 0% −1.00
Redcar 1 0 0% −1.00
Lingfield (AW) 1 0 0% −1.00
Southwell (AW) 1 0 0% −1.00
Newbury 1 0 0% −1.00

DistanceRunsWinsSR£1
6f – 7f 8 0 0% −8.00
1m – 1m1f 2 0 0% −2.00

JockeyRunsWinsSR£1
David Nolan 2 0 0% −2.00
Hollie Doyle 2 0 0% −2.00
Laura Coughlan 1 0 0% −1.00
Luke Morris 1 0 0% −1.00
Charles Bishop 1 0 0% −1.00
Daniel Muscutt 1 0 0% −1.00
Sean Levey 1 0 0% −1.00
David Probert 1 0 0% −1.00

HeadgearRunsWinsSR£1
None 8 0 0% −8.00
Tongue tie + cheekpieces 1 0 0% −1.00
Cheekpieces 1 0 0% −1.00

SeasonRunsWinsSR£1
2025 7 0 0% −7.00
2024 3 0 0% −3.00

Splits include every sample, however small — muted rows are under 3 runs. A one-from-one record is a fact, not a trend: read the Runs column before the strike rate.

Form

DateCourseRace PosBtn Wgt ORSpdKTB Jockey SP
2025 · 7 runs
22 Sep 25+9d Wolverhampton (AW) Download The Raceday Ready App Handicap (Div 2) Class 6 · 7f · Standard · 10 ran Sluggish start - settled near the back wide - made progress into contention 4f out before dropping away 2f out to finish well beaten 9/10 2 8-8 4582A33A Laura Coughlan 40/1
13 Sep 25+53d Bath Euram Air Leases Ireland Handicap (Div 2) Class 6 · 1m · Good To Soft · 11 ran Settled just off the front group early - eager under restraint - moved right and made progress 3f out - pushed along 2f out then dropped away inside the final furlong to finish tenth 10/11 1¾ 8-13 4685A46A Luke Morris 10/1
22 Jul 25+65d Lingfield BetWright Safer Gambling Classified Stakes Class 6 · 7f · Good To Soft · 14 ran Held up towards the back - squeezed for space with three furlongs left - no threat late and finished 7th 7/14 ½ 9-2 4992C47A Charles Bishop 33/1
18 May 25+27d Ripon Racing Welfare Mental Health Awareness Week Handicap Class 6 · 6f · Good · 10 ran Held up towards the back - eased across to the right and made some progress over 2f out - lost ground in the closing stages to finish 6th 6/10 3½ 9-2 5170A47A David Nolan 16/1
21 Apr 25+54d Redcar Watch Race Replays At racingtv.com Handicap Class 6 · 6f · Good To Firm · 15 ran Settled towards the back early - pressed for effort with 2f left - stayed on to go by tiring rivals inside final furlongs - finished 5th 5/15 1¼ 9-7 5377C52A David Nolan 16/1
26 Feb 25+35d Kempton (AW) Unibet Support Safer Gambling Handicap (Div 2) Class 6 · 7f · Standard To Slow · 9 ran Held up at the back - made no impression on the pace - well held at the finish 8/9 ½ 9-9 5768A38A Daniel Muscutt 14/1
22 Jan 25+97d Lingfield (AW) Gamble Responsibly At BetMGM Handicap Class 6 · 1m · Standard · 11 ran Pulled hard early - settled off the pace - pushed along outside final two furlongs - found little and dropped away close home 7/11 2 9-9 6090A59A Sean Levey 16/1
2024 · 3 runs
17 Oct 24+27d Southwell (AW) Golf And Gallop Package Fillies' Novice Stakes (GBB Race) (Div 1) Class 5 · 6f · Standard · 10 ran Held up towards the back of the pack - pushed along with 2f to go but made no headway - finished 8th 8/10 ½ 9-2 —57A52A Hollie Doyle 50/1
20 Sep 24+22d Kempton (AW) Juddmonte British EBF Restricted Novice Stakes (GBB Race) Class 2 · 6f · Standard To Slow · 9 ran Held up towards back of pack - urged forward but couldn't gain ground 2f out - well held at the finish 6/9 3¼ 8-13 —58A53A David Probert 40/1
29 Aug 24 Newbury Pump Technology Maiden Fillies' Stakes (GBB Race) (Div 2) Class 4 · 6f · Good To Firm · 10 ran Settled at the back early - urged forward inside final furlong - made no real impression - finished eighth beaten 4 lengths 8/10 1 9-2 —66A53A Hollie Doyle 22/1

Quick answers

How many races has Lady Diesel won?
Lady Diesel (GB) has yet to win, from 10 archived starts between 2024 and 2025.
Who trained Lady Diesel?
Lady Diesel (GB) was trained by Fergal O'Brien on the most recent run on record, at Wolverhampton (AW) on 22 September 2025.
Who is Lady Diesel's sire?
Lady Diesel (GB) is by Sergei Prokofiev (CAN) out of Midnightly (GB), whose sire is Acclamation.
What is Lady Diesel's official rating?
The most recent official rating on record is 45, from the run on 22 September 2025. The highest on record is 60.
What is Lady Diesel's sire's record?
Sergei Prokofiev (CAN)'s progeny in our archive have won 10.5% of 1,375 runs since Mar 2024 (203 horses), Flat and jumps together.

Record shown from August 2024. Our archive holds racing in Great Britain, Ireland and France from January 2005. Any runs before that, or in other countries, are not in it. In-running comments are available from 2024 onward.