|
300 Metres (Standard: 44.00) |
| 35.79 | | George Sudderick | Walton AC | Bedford | 27 Aug | | |
| 36.61 | | Jaleel Roper | Hercules Wimbledon AC | Carshalton | 9 Apr | | |
| 36.96 | | Memphis Ayoade | Herne Hill Harriers | Crystal Palace | 20 Aug | | |
| 37.4 | | Tyler Panton | Walton AC | Woking | 15 Jul | | |
| 37.77 | | Reuben Leyland | Walton AC | Bedford | 27 Aug | | |
| 38.02 | | Emmanuel Bonney | Sutton & District AC | Bedford | 26 Aug | | |
| 38.17 | | Jack Dickson | Kingston AC & Polytechnic Harriers | Crawley | 22 Apr | | |
| 38.63 | | Matthew Amanor-Boadu | Sutton & District AC | Kingston | 10 Jun | | |
| 38.87 | 2 | George Asprey | Aldershot, Farnham & District AC | Kingston | 13 May | | |
| 39.79 | 4 | Noah Ojumu | Herne Hill Harriers | Kingston | 13 May | | |
| 39.80 | | Jack Goodman | Dorking Mole Valley AC | Kingston | 10 Jun | | |
| 39.84 | | Adam Teale | Camberley & District AC | Kingston | 10 Jun | | |
| 39.9 | | Louis Smithen | Croydon Harriers | Bedford | 16 Jul | | |
| 40.0 | | Joachim Bambury | Croydon Harriers | Bedford | 16 Jul | | |
| 40.2 | | Tyvon Inniss | Croydon Harriers | Reading | 22 Apr | | |
| 40.2 | | Reiss Guest | Aldershot, Farnham & District AC | Reading | 6 Aug | | |
| 40.3 | | Max Dickson | Kingston AC & Polytechnic Harriers | Guildford | 15 Jul | | |
| 40.3 | | Jaden Kennedy | Herne Hill Harriers | Bedford | 16 Jul | | |
| 40.6 | | Thomas White | Kingston AC & Polytechnic Harriers | Coulsdon | 9 Jul | | |
| 40.68 | | Nathanael Pongolati | Hercules Wimbledon AC | Carshalton | 9 Apr | | |
| 40.7 | | Ed Henderson | Aldershot, Farnham & District AC | Guildford | 15 Jul | | |
| 40.8 | | Alessio Udoka Anah | Crawley AC | Horsham | 30 Jun | | |
| 41.2 | | Lenny Oliver | Herne Hill Harriers | Coulsdon | 9 Jul | | |
| 41.4 | 3A | Ned Klasener | Herne Hill Harriers | Carshalton | 30 Apr | | |
| 41.6 | 5A | Oliver Campbell | St Mary's Richmond AC | Wormwood Scrubs | 20 May | | |
| 41.9 | | Kwame Tomlin | Croydon Harriers | Reading | 22 Apr | | |
| 41.9 | | Harley Norman | Epsom & Ewell Harriers | Kingston | 4 Jun | | |
| 41.9 | | Francesco Calemma | Croydon Harriers | Tonbridge | 18 Jun | | |
| 42.0 | | Jacob Stadie | Woking AC | Swindon | 4 Jun | | |
| 42.38 | | Joseph McHugh | Woking AC | Woking | 3 Sep | | |
| 42.6 | | Oscar Voller | Holland Sports AC | Hastings | 20 May | | |
| 42.6 | | Charlie Turner | Aldershot, Farnham & District AC | Aldershot | 27 Aug | | |
| 42.7 | | Adam Robinson | Camberley & District AC | Guildford | 15 Jul | | |
| 42.8 | | Tom Stone | Holland Sports AC | Kingston | 4 Jun | | |
| 42.9 | | Sam Schofield | Guildford & Godalming AC | Guildford | 7 May | | |
| 42.94 | | Josh Cowie | Walton AC | Crawley | 26 Jul | | |
| 43.4 | | Mats Lindstrom | Guildford & Godalming AC | Aldershot | 20 May | | |
| 43.5 | 5A | Joseph Leigh | Holland Sports AC | Brighton | 22 Apr | | |
| 43.5 | | Jude Rainsborough | Guildford & Godalming AC | Kingston | 4 Jun | | |
| 43.5 | | Olly Wilson | Kingston AC & Polytechnic Harriers | Coulsdon | 9 Jul | | |
| 43.6 | 1B | Luke Stevens-Cox | Herne Hill Harriers | Carshalton | 30 Apr | | |
| 43.9 | | Kieran Charles-Chase | Herne Hill Harriers | Reading | 22 Apr | | |
| 43.9 | | Zach Haggar | Waverley Harriers | Woking | 2 Jul | | |