Federation · GBR
Great Britain & NI national best marks
Best mark per athlete by Great Britain & NI athletes in each event, compiled from the all-time lists we import. Derived national bests — not official national records (see note below).
29
Stored athletes
26
Distinct marks shown
Men's 400m
Derived 14 Sep 2026
| # | Athlete | Mark | Date | Venue | Age |
|---|---|---|---|---|---|
| 1 | Matthew Hudson-Smith | 43.44 | 7 Aug 2024 | — | 29 |
| 2 | Charles Dobson | 44.14 | 19 Jul 2025 | — | — |
| 3 | Iwan Thomas | 44.36 | 13 Jul 1997 | — | — |
| 4 | Roger Black | 44.37 | 3 Jul 1996 | — | — |
| 4= | Mark Richardson | 44.37 | 9 Jul 1998 | — | — |
| 6 | Martyn Rooney | 44.45 | 23 Aug 2015 | — | — |
| 7 | David Grindley | 44.47 | 3 Aug 1992 | — | — |
| 8 | Derek Redmond | 44.50 | 1 Sep 1987 | — | — |
| 9 | Rabah Yousif | 44.54 | 24 Aug 2015 | — | — |
| 10 | Tim Benjamin | 44.56 | 9 Sep 2005 | — | — |
| 11 | Jamie Baulch | 44.57 | 3 Jul 1996 | — | — |
| 12 | Samuel Reardon | 44.60 | 27 Jun 2025 | — | — |
| 13 | Du'aine Thorne-Ladejo | 44.66 | 16 Jun 1996 | — | — |
| 13= | Ben Jefferies | 44.66 | 21 Jun 2026 | — | — |
| 15 | Solomon Wariso | 44.68 | 26 Jul 1998 | — | — |
| 16 | Michael Bingham | 44.74 | 19 Aug 2009 | — | — |
| 17 | Lewis Davey | 44.91 | 19 Jul 2025 | — | — |
| 18 | David Jenkins | 44.93 | 21 Jun 1975 | — | — |
| 18= | Kriss Akabusi | 44.93 | 7 Aug 1988 | — | — |
| 20 | Andrew Steele | 44.94 | 18 Aug 2008 | — | — |
| 21 | Daniel Caines | 44.98 | 27 Jul 2002 | — | — |
| 22 | Robert Tobin | 45.01 | 11 Jun 2005 | — | — |
| 23 | Conrad Williams | 45.06 | 6 Jun 2015 | — | — |
| 24 | Alex Haydock-Wilson | 45.08 | 20 Jul 2022 | — | — |
| 25 | Jarryd Dunn | 45.09 | 20 Jun 2015 | — | — |
| 26 | Nigel Levine | 45.11 | 7 Jun 2012 | — | — |
| 27 | Toby Harries | 45.13 | 21 Jun 2025 | — | — |
| 28 | Samael Lunt | 45.16 | 23 May 2026 | — | — |
| 29 | Sean Baldock | 45.20 | 12 Aug 2000 | — | — |
One mark per athlete — the athlete's best while representing Great Britain & NI. Equal marks share a rank ("1=" style). An athlete with marks for two nations appears under each nation represented at the time (e.g. Obikwelu under Nigeria and Portugal).
About this derivation
These lists are derived from the marks in our database — including the complete legal all-time lists imported from alltime-athletics.com — grouped by the nation the athlete was representing at each mark. They are not official national records: federations ratify national records under their own eligibility rules, and some marks here may not qualify.