Open/Male - Long Course - 400m Individual Medley - British - All Time - 14 Years Age Group - Age On Day
| Rank | Name | Ranked Club | YoB | Meet | Date | Time |
|---|---|---|---|---|---|---|
| 1 | Matthew Johnson | Spenborough | 95 | British Gas Championships, Sheffield | 01/04/10 | 4:23.51 |
| 2 | Charlie Hutchison | Lboro Uni | 02 | British Swimming Championships 2017, Sheffield | 20/04/17 | 4:26.26 |
| 3 | Nathan Hughes | Swansea Uni | 00 | British Championships 2015, London | 17/04/15 | 4:29.67 |
| 4 | Llewellyn Porter | Camden Swiss | 08 | British Swimming Championships 2023, Sheffield | 06/04/23 | 4:32.23 |
| 5 | Matthew Richards | Millfield | 02 | British Summer Championships, Sheffield | 27/07/17 | 4:34.81 |
| 6 | Martyn Walton | UniOfStirl | 97 | BG ASA National Age Groups Championships, Sheffield | 26/07/12 | 4:35.64 |
| 7 | Jarvis Parkinson | Chelsea&West | 98 | British Gas International 2013, Leeds | 09/03/13 | 4:35.68 |
| Matthew George | Co Salford | 00 | British Summer Championships, Sheffield | 28/07/15 | 4:35.68 | |
| 9 | Max Jameson | Thanet Swim | 00 | British Summer Championships, Sheffield | 28/07/15 | 4:36.12 |
| 10 | Mark Szaranek | Carnegie | 95 | British Gas Nat Age Grps, Sheffield | 01/08/10 | 4:37.26 |
| 11 | Adam Wilson | Co Sheffield | 01 | British Summer Championships, Sheffield | 28/07/16 | 4:37.44 |
| 12 | George Smith | UniOfStirl | 04 | British Championships 2019, Glasgow | 18/04/19 | 4:37.62 |
| 13 | Samuel Straughan | Lboro Uni | 93 | British Champs (50m) 2008, Sheffield | 03/04/08 | 4:37.77 |
| 14 | Kieran Bird | Bath Univ | 99 | BG ASA National Age Groups Champs 2014, Sheffield | 01/08/14 | 4:37.85 |
| 15 | Joseph Poynter | S Bournem'th | 95 | British Gas Nat Age Grps, Sheffield | 26/07/09 | 4:38.32 |
| 16 | Joel Thompson | Shiverers | 01 | Standard Energy Cup 2016, Lignanao | 30/04/16 | 4:38.35 |
| 17 | Luke Greenbank | Lboro Uni | 97 | BG ASA National Age Groups Championships, Sheffield | 26/07/12 | 4:38.47 |
| 18 | Filip Nowacki | TigersJersey | 07 | British Summer Championships, Sheffield | 25/07/22 | 4:38.60 |
| 19 | William Bell | Lboro Uni | 02 | ASA East Midland Region Swimming Champs, Sheffield | 30/04/16 | 4:39.00 |
| 20 | Alfie Collins | Co Cambridge | 00 | British Summer Championships, Sheffield | 28/07/15 | 4:39.34 |
| 21 | Joe Litchfield | Lboro Uni | 98 | ASANER Age Group Championships, Sheffield | 02/06/13 | 4:39.55 |
| 22 | Max Litchfield | Co Sheffield | 95 | British Gas Nat Age Grps, Sheffield | 26/07/09 | 4:39.60 |
| 23 | Fraser Minnican | Lboro Uni | 95 | British Gas Nat Age Grps, Sheffield | 01/08/10 | 4:39.65 |
| 24 | Jacob Greenow | BradfordAvon | 99 | BG ASA National Age Groups 2013, Sheffield | 28/07/13 | 4:39.70 |
| 25 | David Gregory | Stockport Mo | 92 | National Age Groups 2007, Sheffield | 24/07/07 | 4:39.83 |