EVENT 206 Mens 400m Individual Medley - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 3 | 1 | Samuel LAWTON | 15 | Keynsham | 5:16.50 |
| 4 | 2 | Charlie KENDALL | 16 | Exeter City | 5:15.30 |
| 5 | 3 | Ben RAWLINS | 16 | Southwold | 5:15.10 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 4 | Donald BISSET | 15 | Gloucester | 5:14.50 |
| 1 | 5 | Keir GRAHAM | 18 | Yeovil | 5:13.80 |
| 2 | 6 | Harrison JONES | 17 | Chippenham | 5:11.50 |
| 3 | 7 | Dylan HOOD | 15 | Aquae Sulis | 5:10.80 |
| 4 | 8 | Henry BENNETT | 16 | Southwold | 5:09.40 |
| 5 | 9 | Chandler SAER | 16 | Aquae Sulis | 5:08.90 |
| 6 | 10 | Benjamin ATAL | 17 | Wellington W | 5:07.00 |
| 7 | 11 | George SPENCER | 18 | St Austell A | 5:06.80 |
| 8 | 12 | Jacob BAILEY | 16 | Yeovil | 5:02.60 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 13 | Adam HALL | 15 | Gloucester | 5:02.20 |
| 1 | 14 | Lewis SMART | 15 | Mt Kelly | 5:00.84 |
| 2 | 15 | Andrew BOTROS | 18 | Poole | 5:00.80 |
| 3 | 16 | Benjamin PORTER | 19 | Poole | 4:58.00 |
| 4 | 17 | James KING | 16 | Weston S M | 4:57.70 |
| 5 | 18 | Thomas BREW | 16 | Mt Kelly | 4:57.10 |
| 6 | 19 | Christian TAI | 15 | Bourmth Coll | 4:55.93 |
| 7 | 20 | Jacob NEWCOMBE | 15 | Mt Kelly | 4:55.40 |
| 8 | 21 | Tai ROCHE-WALKER | 15 | Plymouth Lea | 4:55.10 |
| 9 | 22 | Henry DIXON | 16 | Aquae Sulis | 4:51.38 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 24 | James WATSON | 16 | Swindon Dolp | 4:45.20 |
| 1 | 26 | Ben HARRISON | 16 | Mt Kelly | 4:43.18 |
| 2 | 28 | Jakob GOODMAN | 16 | Millfield | 4:40.20 |
| 3 | 30 | William COLE | 17 | Co Bristol | 4:36.50 |
| 4 | 32 | Craig MUNDEN | 19 | Gloucester | 4:27.40 |
| 5 | 31 | Tony-Joe TRETT OLIVER | 17 | Mt Kelly | 4:34.90 |
| 6 | 29 | Freddy CLAMPETT | 18 | Plymouth Lea | 4:38.50 |
| 7 | 27 | Alexander SEYMOUR | 17 | Mt Kelly | 4:41.40 |
| 8 | 25 | Adam BROWN | 17 | Millfield | 4:44.10 |
| 9 | 23 | George LEAMAN | 17 | Clevedon | 4:46.60 |