|
400 Metres (Standard: 58.00) |
| 49.81 | | Klaysen Brandao Kafuti | Croydon Harriers | Kingston | 11 Jun | | |
| 50.04 | | Ethan Curran | Crawley AC | Sports City | 8 Jul | | |
| 50.27 | 1 | Samuel Mowa | Blackheath & Bromley Harriers AC | Kingston | 15 May | | |
| 50.74 | | Hayden Christian | Guildford & Godalming AC | Bedford | 17 Sep | | |
| 50.94 | | Conor Kelly | Hercules Wimbledon AC | Carshalton | 12 Jun | | |
| 50.94 | | Joshua Martin | Hercules Wimbledon AC | Horspath | 16 Jul | | |
| 51.00 | | Keeran Sriskandarajah | Herne Hill Harriers | Horspath | 23 Jul | | |
| 51.29 | 4 | Noah Ridgeon | Sutton & District AC | Kingston | 15 May | | |
| 51.62 | 5 | Zac Crowther | Herne Hill Harriers | Kingston | 15 May | | |
| 52.02 | | Connor Foley | Kingston AC & Polytechnic Harriers | Stevenage | 7 Aug | | |
| 52.2 | | Will Panes | Guildford & Godalming AC | Walton | 26 Jun | | |
| 52.4 | | George Pittwood | Walton AC | Carshalton | 10 Sep | | |
| 52.9 | | Sam Atkins | Kingston AC & Polytechnic Harriers | Walton | 26 Jun | | |
| 53.04 | | Will Panes | Guildford & Godalming AC | Chelmsford | 14 Aug | | |
| 53.54 | | Samuel Stapley | Reigate Priory AC | Lewes | 26 Jun | | |
| 53.54 | | Oliver Connor | Camberley & District AC | Aldershot | 18 Aug | | |
| 53.69 | | George Pittwood | Walton AC | Portsmouth | 4 Sep | | |
| 53.70 | | Kieran Bouwmeester-Reid | St Mary's Richmond AC | Horspath | 23 Jul | | |
| 53.88 | | Logan Hogg | Surrey Schools | Kingston | 11 Jun | | |
| 54.03 | | Sean Salter | Walton AC | Aldershot | 12 Jun | | |
| 54.4 | | Kai Collins | Guildford & Godalming AC | Guildford | 22 May | | |
| 54.45 | | Luke Oryem | Walton AC | Perivale | 24 Apr | | |
| 54.79 | | Louis Powell | Surrey Schools | Kingston | 11 Jun | | |
| 55.1 | | Zeb Baker | Guildford & Godalming AC | Bracknell | 10 Jul | | |
| 55.18 | | Zeb Baker | Guildford & Godalming AC | Aldershot | 18 Aug | | |
| 56.2 | | Danny Trowell | Epsom & Ewell Harriers | Carshalton | 10 Sep | | |
| 56.21 | 7 | Danny Trowell | Epsom & Ewell Harriers | Kingston | 15 May | | |
| 56.32 | | Nickolas Zanetta | Croydon Harriers | Canterbury | 26 Jun | | |
| 56.53 | | Harry Quinn | Aldershot, Farnham & District AC | Aldershot | 18 Aug | | |
| 56.90 | | Arthur Peachey | Holland Sports AC | Kingston | 11 Jun | | |
| 56.9 | | James Wells | Waverley Harriers | Horspath | 26 Jun | | |
| 56.91 | | Tom Foden | Kingston AC & Polytechnic Harriers | Perivale | 24 Apr | | |
| 57.03 | | Kyron-Bailee Burke | Croydon Harriers | Croydon | 22 May | | |
| 57.36 | | Drew Greyling | Woking AC | Woking | 26 Jun | | |
| 57.50 | | Max Lorke | South London Harriers | Carshalton | 3 Sep | | |
| 57.56 | | Sam Long | Holland Sports AC | Gillingham | 10 Apr | | |
| 57.7 | | Yahya Samara | Guildford & Godalming AC | Bracknell | 10 Jul | | |
| 57.71 | | Joel Konadu | Croydon Harriers | Canterbury | 26 Jun | | |
| 57.80 | | Oluwafikayomi Awolope | Herne Hill Harriers | Tooting Bec | 7 Aug | | |
| 58.0 | | Harry Findlay | Camberley & District AC | Southampton | 10 Apr | | |