EVENT 156 Mens MC 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 2 | 1 | Matthew CLOWES | 17 | S8 | Caradon | 5:38.40 |
| 3 | 2 | Benjamin HALL | 15 | | Gloucester | 4:37.70 |
| 4 | 3 | Evan BRUNSDON | 15 | | Weston S M | 4:35.40 |
| 5 | 4 | Oliver HADDRELL | 15 | | Cheltenham | 4:34.80 |
| 6 | 5 | Henry TASWELL | 15 | | Chard | 4:33.90 |
| 7 | 6 | Jack GIBERT | 15 | | Co Bristol | 4:33.48 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 2 | 7 | George FARR | 15 | | Co Bristol | 4:31.41 |
| 3 | 8 | Henry BENNETT | 16 | | Southwold | 4:28.50 |
| 4 | 9 | Ethan RAYMENT | 15 | | Plymouth Lea | 4:27.80 |
| 5 | 10 | Jacob NEWCOMBE | 15 | | Mt Kelly | 4:27.00 |
| 6 | 11 | Morgan NEWMAN | 16 | | Plymouth Lea | 4:27.00 |
| 7 | 12 | Christian TAI | 15 | | Bourmth Coll | 4:26.24 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 0 | 13 | Lyndon HOLMES-BEDDOW | 16 | | St Ives Bay | 4:25.80 |
| 1 | 14 | Jay SNOWDEN | 16 | | Plymouth Lea | 4:24.00 |
| 2 | 15 | Edward MADDOCKS | 15 | | Mt Kelly | 4:23.60 |
| 3 | 16 | Rupert HAGUE | 15 | | Millfield | 4:23.30 |
| 4 | 17 | Thomas BREW | 16 | | Mt Kelly | 4:21.50 |
| 5 | 18 | Adam HALL | 15 | | Gloucester | 4:21.00 |
| 6 | 19 | Christopher MALONE | 16 | | Gloucester | 4:20.00 |
| 7 | 20 | George LEAMAN | 17 | | Clevedon | 4:19.60 |
| 8 | 21 | Angus JARVIS | 17 | | N Cornwall | 4:19.50 |
| 9 | 22 | William DAVIES | 16 | | Swindon Dolp | 4:18.68 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 0 | 23 | Andrew PAIGE | 17 | | Mt Kelly | 4:17.20 |
| 1 | 24 | Tai ROCHE-WALKER | 15 | | Plymouth Lea | 4:16.84 |
| 2 | 25 | Matthew COLLINS | 16 | | Poole | 4:16.50 |
| 3 | 26 | Matthew MUNDEN | 17 | | Gloucester | 4:15.50 |
| 4 | 27 | Alexander SEYMOUR | 17 | | Mt Kelly | 4:14.80 |
| 5 | 28 | Ben HARRISON | 16 | | Mt Kelly | 4:14.10 |
| 6 | 29 | Henry DIXON | 16 | | Aquae Sulis | 4:13.70 |
| 7 | 30 | Oscar BRAIN | 15 | | Plymouth Lea | 4:13.70 |
| 8 | 31 | Adam DAVIES | 15 | | Plymouth Lea | 4:12.63 |
| 9 | 32 | Dominic WOOLDRIDGE | 21 | | Exeter City | 4:10.20 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 0 | 34 | Thomas KINGHAM | 18 | | Millfield | 4:06.70 |
| 1 | 36 | James WATSON | 16 | | Swindon Dolp | 4:06.50 |
| 2 | 38 | Jakob GOODMAN | 16 | | Millfield | 4:05.80 |
| 3 | 40 | Max MCCUSKER | 17 | | Millfield | 4:03.20 |
| 4 | 42 | Julian CHAN QUEE LIN | 19 | | Mt Kelly | 3:59.31 |
| 5 | 41 | Craig MUNDEN | 19 | | Gloucester | 4:02.60 |
| 6 | 39 | Oliver JARVIS | 19 | | N Cornwall | 4:05.70 |
| 7 | 37 | William COLE | 17 | | Co Bristol | 4:06.40 |
| 8 | 35 | Reece WORTH | 20 | | Mt Kelly | 4:06.60 |
| 9 | 33 | Tony-Joe TRETT OLIVER | 17 | | Mt Kelly | 4:07.40 |