EVENT 102 Men's 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 1 | Jack Booth Rudd | 20 | Portsmouth N | 4:08.80 |
| 1 | 3 | Morgan Davies | 16 | Guildford Ct | 4:08.75 |
| 2 | 5 | Jack Jenkinson | 18 | Skipton | 4:08.68 |
| 3 | 7 | Cameron Carlos | 19 | Barnet Copt | 4:07.72 |
| 4 | 9 | Jacob Lee | 18 | Leic Sharks | 4:07.46 |
| 5 | 8 | Brodie Gordon-Gibson | 19 | Edinburgh Un | 4:07.58 |
| 6 | 6 | Joseph Kingsland | 21 | Nova Cent'n | 4:07.96 |
| 7 | 4 | Maxwell Adams | 19 | Wycombe Dist | 4:08.75 |
| 8 | 2 | Daniel Cox | 20 | Birm'ham Uni | 4:08.77 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 11 | Max Geysen-Holley | 19 | Co Cardiff | 4:07.18 |
| 1 | 13 | Dylan Gallagher | 21 | Swansea Uni | 4:07.04 |
| 2 | 15 | Donatas Dragasius | 20 | Co Manch Aq | 4:06.54 |
| 3 | 17 | Denys Mialkovskyi | 17 | RTW Monson | 4:05.90 |
| 4 | 19 | Henry Baker | 21 | UniOfStirl | 4:05.56 |
| 5 | 18 | James Froggatt | 19 | Co Birm'ham | 4:05.81 |
| 6 | 16 | Cameron Wrapson | 18 | Co Birm'ham | 4:06.40 |
| 7 | 14 | Scott Fleming | 18 | Eastkilbride | 4:06.93 |
| 8 | 12 | Luca Staines | 20 | Swansea Uni | 4:07.17 |
| 9 | 10 | Gabriel Shepherd | 16 | Co Leeds | 4:07.41 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 21 | Matthew Deffains | 17 | TigersJersey | 4:05.08 |
| 1 | 23 | Luke Booth | 19 | Rotherham Mo | 4:04.94 |
| 2 | 25 | Llewellyn Porter | 16 | Camden Swiss | 4:04.85 |
| 3 | 27 | Thomas Sansome | 21 | Lboro Uni | 4:04.62 |
| 4 | 29 | Kourosh Khodakhah | 17 | Co Leeds | 4:04.54 |
| 5 | 28 | Josh Denholm | 19 | Newcastle | 4:04.58 |
| 6 | 26 | George Barber | 23 | Co Sheffield | 4:04.81 |
| 7 | 24 | Matthew Baker | 18 | West Suffolk | 4:04.88 |
| 8 | 22 | Samuel Tucker | 20 | Lboro Uni | 4:05.00 |
| 9 | 20 | Reece Blackett | 18 | Newcastle | 4:05.14 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 31 | Ethan Kelly | 16 | Co Liverpool | 4:04.22 |
| 1 | 33 | James Raw | 17 | Leic Sharks | 4:03.98 |
| 2 | 35 | James Shevchenko | 19 | Royal Wolv | 4:03.75 |
| 3 | 37 | Hayden Annan | 17 | RTW Monson | 4:03.31 |
| 4 | 39 | Isaac Dodds | 20 | Bath Univ | 4:03.09 |
| 5 | 38 | Samuel Sterry | 17 | TigersJersey | 4:03.19 |
| 6 | 36 | Jude Liddiard | 23 | Edinburgh Un | 4:03.44 |
| 7 | 34 | Michael James Flynn | 21 | Co Glasgow | 4:03.81 |
| 8 | 32 | Alexander Harrand | 19 | Derby Excel | 4:04.14 |
| 9 | 30 | Jonathan Turck | 18 | Mt Kelly | 4:04.41 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 41 | Samuel Lander | 18 | Mt Kelly | 4:02.61 |
| 1 | 43 | Ewan Wilson | 22 | Co Sheffield | 4:02.42 |
| 2 | 45 | Ethan Rayment | 23 | Plymouth Lea | 4:01.89 |
| 3 | 47 | Rafae Shafi | 19 | Repton | 4:01.18 |
| 4 | 49 | Evan Davidson | 17 | Perth City | 4:00.42 |
| 5 | 48 | Oliver Rowe | 18 | Mt Kelly | 4:00.79 |
| 6 | 46 | Cameron Travis | 20 | UoAPS | 4:01.86 |
| 7 | 44 | Finn Drysdale | 19 | Royal Wolv | 4:02.07 |
| 8 | 42 | Solomon Williams | 19 | Millfield | 4:02.49 |
| 9 | 40 | Reuben Visda | 21 | Co Sheffield | 4:02.71 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 52 | Tony Joe Trett Oliver | 25 | UniOfStirl | 3:59.49 |
| 1 | 56 | Joseph Deighan | 21 | Swansea Uni | 3:57.76 |
| 2 | 60 | David Annis | 18 | Royal Wolv | 3:56.66 |
| 3 | 64 | Alexander Sargeant | 22 | Millfield | 3:55.41 |
| 4 | 68 | Luke Turley | 24 | Bath PC | 3:48.31 |
| 5 | 66 | William Bell | 22 | Lboro Uni | 3:52.98 |
| 6 | 62 | Luke McGee | 18 | N & D PP SC | 3:56.46 |
| 7 | 58 | Max Tambling | 25 | Winchester | 3:57.48 |
| 8 | 54 | James McClure | 18 | Co Birm'ham | 3:58.58 |
| 9 | 50 | Christian Duetoft | 19 | Guildford Ct | 4:00.26 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 53 | Sean McCann | 19 | Lboro Uni | 3:58.74 |
| 1 | 57 | Jack Muncey | 21 | UniOfStirl | 3:57.73 |
| 2 | 61 | Josh Williams | 22 | Swansea Uni | 3:56.62 |
| 3 | 65 | Reece Grady | 19 | Stockport Mo | 3:54.38 |
| 4 | 69 | Kieran Bird | 25 | Bath PC | 3:47.96 |
| 5 | 67 | Tyler Melbourne-Smith | 19 | Lboro Uni | 3:52.37 |
| 6 | 63 | Harry Wynne-Jones | 19 | Co Milton K | 3:56.20 |
| 7 | 59 | Thomas Trebilcock | 21 | Swansea Uni | 3:57.29 |
| 8 | 55 | Luke Hornsey | 18 | Edinburgh Un | 3:58.52 |
| 9 | 51 | Arthur Logan | 20 | Edinburgh Un | 3:59.64 |