EVENT 206 Mens Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 2 | 1 | Harvie GREENWOOD | 15 | TigersharksW | 5:15.10 |
| 3 | 2 | George LANGMAN | 15 | Weston S M | 5:14.37 |
| 4 | 3 | Marshall FITCHETT | 15 | TigersharksW | 5:11.63 |
| 5 | 4 | Lucas BENNETT | 15 | Co Bristol | 5:10.33 |
| 6 | 5 | Luke MORGAN | 16 | Swindon Dolp | 5:08.79 |
| 7 | 6 | Jacob O'HARA | 15 | Seagulls SC | 5:08.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 7 | Joshua FRAMPTON | 16 | South Dorset | 5:07.59 |
| 1 | 8 | Ben RAWLINS | 17 | Southwold | 5:07.31 |
| 2 | 9 | Jake BENTLEY | 18 | Mt Kelly | 5:06.90 |
| 3 | 10 | Harrison JONES | 18 | Chippenham | 5:04.68 |
| 4 | 11 | Henry BENNETT | 17 | Southwold | 5:00.25 |
| 5 | 12 | Jack GIBERT | 16 | Co Bristol | 4:59.80 |
| 6 | 13 | Evan BRUNSDON | 16 | Weston S M | 4:58.58 |
| 7 | 14 | Euan DUNGAVEL | 17 | Truro City | 4:58.50 |
| 8 | 15 | Daniel AHMED | 17 | Soundwell | 4:57.46 |
| 9 | 16 | Benjamin ATAL | 18 | Wellington W | 4:57.46 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 17 | Simon SWEATMAN | 15 | Millfield | 4:56.49 |
| 1 | 18 | Donald BISSET | 16 | Gloucester | 4:56.13 |
| 2 | 19 | Samuel LAWTON | 16 | Co Bristol | 4:55.10 |
| 3 | 20 | George SPENCER | 19 | St Austell A | 4:54.12 |
| 4 | 21 | Jacob BAILEY | 17 | Yeovil | 4:52.05 |
| 5 | 22 | Chandler SAER | 17 | Team Bath AS | 4:51.69 |
| 6 | 23 | Benjamin PORTER | 20 | Poole | 4:50.63 |
| 7 | 24 | Lewis SMART | 16 | Mt Kelly | 4:48.60 |
| 8 | 25 | Ethan MCNEIL | 15 | Team Bath AS | 4:47.32 |
| 9 | 26 | Jack SMITH | 16 | Soundwell | 4:46.99 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 27 | Thomas BREW | 17 | Mt Kelly | 4:46.80 |
| 1 | 28 | Oliver FAIRMAN | 15 | S Bournem'th | 4:46.70 |
| 2 | 29 | Joseph RUSSELL | 15 | Mt Kelly | 4:44.80 |
| 3 | 30 | Dylan HOOD | 16 | Team Bath AS | 4:44.36 |
| 4 | 31 | James KING | 17 | Weston S M | 4:43.60 |
| 5 | 32 | Christian TAI | 16 | Bourmth Coll | 4:43.59 |
| 6 | 33 | Jacob NEWCOMBE | 16 | Mt Kelly | 4:43.34 |
| 7 | 34 | Huw WILLIAMS | 15 | Millfield | 4:41.85 |
| 8 | 35 | David CHANG | 16 | Millfield | 4:41.41 |
| 9 | 36 | Michal KOTLEWSKI | 23 | Utd Bristol | 4:40.73 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 38 | George LEAMAN | 18 | Clevedon | 4:37.52 |
| 1 | 40 | Reiss ORMONDE-CUNNINGH | 19 | Mt Kelly | 4:36.32 |
| 2 | 42 | Samuel PECK | 17 | Mt Kelly | 4:35.27 |
| 3 | 44 | Adam BROWN | 18 | Millfield | 4:34.60 |
| 4 | 46 | Kieran BIRD | 18 | Millfield | 4:28.33 |
| 5 | 45 | Ben HARRISON | 17 | Mt Kelly | 4:34.35 |
| 6 | 43 | Henry DIXON | 17 | Mt Kelly | 4:34.93 |
| 7 | 41 | William HENDRY | 17 | Millfield | 4:36.10 |
| 8 | 39 | Adam DAVIES | 16 | Plymouth Lea | 4:36.75 |
| 9 | 37 | Matthew MUNDEN | 18 | Gloucester | 4:40.70 |