EVENT 111 Men 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Jack Hurry | 14 | Northampton | 5:09.56 |
| 4 | 3 | Ethan Thorpe | 14 | Basildon Ph | 5:09.32 |
| 5 | 2 | Henry Shepherd | 13 | Bromley | 5:09.34 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 4 | Xander Tovey | 13 | Co Coventry | 5:07.56 |
| 1 | 6 | Jeremiah Carnegie | 14 | Beckenham | 5:06.95 |
| 2 | 8 | Leo Talbot | 13 | Bolton Metro | 5:05.81 |
| 3 | 10 | Arthur Owens | 14 | Co Leeds | 5:04.91 |
| 4 | 12 | Jack Keers | 14 | Teddington | 5:04.19 |
| 5 | 11 | Skye Sharples | 14 | Portsmouth N | 5:04.25 |
| 6 | 9 | Makar Yakhno | 13 | Portsmouth N | 5:05.04 |
| 7 | 7 | Ernest Darkin | 14 | Dulwich Dolp | 5:06.52 |
| 8 | 5 | Lucas Lovell | 14 | Portsmouth N | 5:07.29 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 14 | Aubry Armada Bennett | 15 | RTW Monson | 5:03.52 |
| 1 | 16 | Charlie Ward | 15 | N & D PP SC | 5:02.96 |
| 2 | 18 | Owen Reed | 15 | Billingham | 5:02.48 |
| 3 | 20 | Jasper Hall | 15 | Newcastle | 5:02.33 |
| 4 | 22 | Harrison Clarke | 15 | Nova Cent'n | 5:02.19 |
| 5 | 21 | Charley King | 15 | Thanet Swim | 5:02.24 |
| 6 | 19 | Orlando Dearing | 15 | Co Peterboro | 5:02.48 |
| 7 | 17 | Elliot Lawton | 15 | Co Coventry | 5:02.87 |
| 8 | 15 | Kaiden Hitchins | 13 | Co Birm'ham | 5:03.14 |
| 9 | 13 | James Wright | 14 | Millfield | 5:03.66 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 24 | Austin May | 17 | Soundwell | 5:02.17 |
| 1 | 26 | Nicholas Land | 15 | Newcastle | 5:01.84 |
| 2 | 28 | Damien Batchelor | 16 | Co Birm'ham | 5:01.28 |
| 3 | 30 | Harvey Reed | 16 | Co Birm'ham | 5:01.24 |
| 4 | 32 | Aden McCarthy | 16 | Bracknell | 5:01.03 |
| 5 | 31 | Valerio Thompson | 16 | Millfield | 5:01.11 |
| 6 | 29 | Alfie Owen | 14 | Wigan BEST | 5:01.25 |
| 7 | 27 | Niklas Saukko-Paavola | 15 | Nova Cent'n | 5:01.41 |
| 8 | 25 | Johnathan Ireland | 15 | Maidenhead | 5:02.15 |
| 9 | 23 | Harry Allen | 14 | Tiverton | 5:02.19 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 34 | Patrick Dea | 16 | Co Coventry | 5:00.61 |
| 1 | 36 | Oscar Goldsmith | 15 | South Lincs | 5:00.18 |
| 2 | 38 | Monty Smith | 14 | Wycombe Dist | 5:00.06 |
| 3 | 40 | Harry Cocks | 15 | Thanet Swim | 4:59.85 |
| 4 | 42 | Jimmy McGuire | 15 | N & D PP SC | 4:59.83 |
| 5 | 41 | Samuel Williams | 16 | Wycombe Dist | 4:59.83 |
| 6 | 39 | Luke Chambers | 15 | Nova Cent'n | 4:59.89 |
| 7 | 37 | Arron Hopkins | 16 | Poole | 5:00.14 |
| 8 | 35 | Alan Parra-Manzo | 16 | Maidenhead | 5:00.25 |
| 9 | 33 | George Hayward | 17 | Plymouth Lea | 5:00.73 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 44 | Oscar Devaal | 14 | Biddulph | 4:59.77 |
| 1 | 46 | Matthew Scott | 14 | Newcastle | 4:59.59 |
| 2 | 48 | Peter McGrother | 17 | Durham City | 4:59.27 |
| 3 | 50 | Louis Dubbeldam | 17 | Durham City | 4:59.14 |
| 4 | 52 | Gabriel Barrot | 16 | Camden Swiss | 4:58.80 |
| 5 | 51 | Harry Kerslake | 15 | Soundwell | 4:58.97 |
| 6 | 49 | Kian Lee | 15 | Co Peterboro | 4:59.15 |
| 7 | 47 | Joseph Mulligan | 17 | Nova Cent'n | 4:59.58 |
| 8 | 45 | Sandijs Cecins | 16 | Colchester | 4:59.64 |
| 9 | 43 | Austyn Manley | 13 | Nova Cent'n | 4:59.83 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 54 | Charlie Hinson | 15 | Co Leeds | 4:58.19 |
| 1 | 56 | Jack Bignell | 15 | Northampton | 4:58.12 |
| 2 | 58 | Daniel Walker | 16 | Nova Cent'n | 4:57.84 |
| 3 | 60 | Charlie Rounce | 16 | Leamington | 4:57.52 |
| 4 | 62 | George Prince | 15 | Putteridge | 4:57.24 |
| 5 | 61 | Jack Finnie | 16 | Rotherham Mo | 4:57.51 |
| 6 | 59 | William Taylor | 16 | Chase | 4:57.74 |
| 7 | 57 | Max El-Mokadem | 15 | RTW Monson | 4:57.92 |
| 8 | 55 | Jamie Steadman | 16 | Clevedon | 4:58.17 |
| 9 | 53 | Casey Croucher | 16 | Co Bristol | 4:58.32 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 64 | Ben Minister | 17 | Thurrock | 4:55.76 |
| 1 | 66 | Lewis Jarrett | 17 | Romford Town | 4:55.62 |
| 2 | 68 | Oliver Oxley | 17 | Co Leicester | 4:55.17 |
| 3 | 70 | Jad Idris | 17 | Co Leeds | 4:54.38 |
| 4 | 72 | Veer Kassan | 17 | Co Milton K | 4:53.52 |
| 5 | 71 | Oren Jones | 17 | Crawley | 4:54.36 |
| 6 | 69 | James Lake | 16 | Loughborough | 4:54.96 |
| 7 | 67 | Max Harvey | 16 | Co Liverpool | 4:55.60 |
| 8 | 65 | James Escolme | 17 | Carnforth | 4:55.67 |
| 9 | 63 | Lewis Turner | 17 | Winsford | 4:56.03 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 75 | Jack Rudd | 19 | Maidenhead | 4:52.64 |
| 1 | 79 | Bryan Dinev | 17 | Bromley | 4:51.88 |
| 2 | 83 | William Miles | 19 | Basingstoke | 4:49.92 |
| 3 | 87 | Elliot Best | 19 | Newcastle | 4:45.28 |
| 4 | 91 | B Howarth-Osborne | 19 | Co Sheffield | 4:41.40 |
| 5 | 89 | Donatas Dragasius | 19 | Mt Kelly | 4:42.58 |
| 6 | 85 | Ethan Ellis-Sixsmith | 20 | Co Sheffield | 4:48.50 |
| 7 | 81 | Ethan Wright | 21 | Winsford | 4:50.09 |
| 8 | 77 | Daniel Moyses | 17 | Co Peterboro | 4:52.10 |
| 9 | 73 | Ben Gilchrist | 22 | RichmondDale | 4:52.83 |
| Heat Number - 10 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 76 | Solomon Kendrick | 18 | Shiverers | 4:52.49 |
| 1 | 80 | Nathan Chapman | 19 | Mt Kelly | 4:51.14 |
| 2 | 84 | Mason Bland | 19 | Co Manch Aq | 4:49.56 |
| 3 | 88 | Joshua Press | 20 | UniOfStirl | 4:43.98 |
| 4 | 92 | Myles Turner | 23 | West Suffolk | 4:40.80 |
| 5 | 90 | Joseph Buxton | 20 | Reading | 4:42.06 |
| 6 | 86 | Daniel Cox | 19 | Wycombe Dist | 4:47.43 |
| 7 | 82 | Daniel McGuinness | 17 | Basildon Ph | 4:50.07 |
| 8 | 78 | David Allen | 18 | Sevenoaks | 4:52.03 |
| 9 | 74 | James Cummings-Candal | 18 | Portsmouth N | 4:52.71 |