EVENT 208 Mens MC 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 2 | 1 | Charles HYDE | 15 | S14 | Soundwell | 5:28.79 |
| 3 | 2 | James EDWARDS | 18 | S14 | Calne Alpha | 4:50.66 |
| 4 | 3 | Jonah SILK | 14 | | Co Bristol | 4:29.58 |
| 5 | 4 | George WILLIAMS | 16 | | Soundwell | 4:29.40 |
| 6 | 5 | Jack GIBERT | 16 | | Co Bristol | 4:29.08 |
| 7 | 6 | Ben PENHALE | 14 | | TauntonDeane | 4:28.74 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 2 | 7 | Sean-Patrick MCGOWAN | 14 | | Millfield | 4:28.07 |
| 3 | 8 | Thomas TREBILCOCK | 14 | | Truro City | 4:26.60 |
| 4 | 9 | Jesus VELAZCO RIOS | 16 | | Mt Kelly | 4:26.51 |
| 5 | 10 | Ethan RAYMENT | 16 | | Plymouth Lea | 4:25.90 |
| 6 | 11 | Batuhan PAKER | 15 | | Plymouth Lea | 4:24.50 |
| 7 | 12 | David MORTON | 16 | | Bourmth Coll | 4:24.40 |
| 8 | 13 | Robert WHITTAKER | 16 | | Barnstaple | 4:24.24 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 14 | Thomas BREW | 17 | | Mt Kelly | 4:22.92 |
| 2 | 15 | Linus LAUNHARDT | 15 | | Mt Kelly | 4:20.40 |
| 3 | 16 | George FARR | 16 | | Co Bristol | 4:19.84 |
| 4 | 17 | Jack SMITH | 16 | | Co Bristol | 4:19.20 |
| 5 | 18 | Zachary DERRICK | 16 | | Co Bristol | 4:18.20 |
| 6 | 19 | William COLE | 18 | | Co Bristol | 4:14.50 |
| 7 | 20 | Jay SNOWDEN | 17 | | Plymouth Lea | 4:13.94 |
| 8 | 21 | Joseph RUSSELL | 15 | | Mt Kelly | 4:12.50 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 23 | William DAVIES | 17 | | Swindon Dolp | 4:12.19 |
| 2 | 25 | Dominic WOOLDRIDGE | 22 | | Exeter City | 4:08.50 |
| 3 | 27 | Adam DAVIES | 16 | | Plymouth Lea | 4:06.50 |
| 4 | 29 | Jakob GOODMAN | 17 | | Millfield | 3:55.67 |
| 5 | 28 | Kieran BIRD | 18 | | Millfield | 3:56.46 |
| 6 | 26 | Julian CHAN QUEE LIN | 20 | | Mt Kelly | 4:07.92 |
| 7 | 24 | Ben HARRISON | 17 | | Mt Kelly | 4:11.31 |
| 8 | 22 | Henry DIXON | 17 | | Team Bath AS | 4:12.24 |