EVENT 103 Open/Male 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Ilan LEWIS | 10 | Caernarfon | 1:57.70 |
| 3 | 4 | Taylor PRINCE | 11 | Conwy | 1:48.30 |
| 4 | 6 | Daniel RAWLINGS | 11 | Co Leeds | 1:41.90 |
| 5 | 5 | Devon BRADSHAW | 10 | Co Sheffield | 1:45.49 |
| 6 | 3 | Oliver SHEPHARD | 9 | Co Sheffield | 1:53.09 |
| 7 | 1 | Max ARMSTRONG | 9 | Co Sheffield | 2:20.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Jayden GRAY-THOMAS | 12 | Conwy | 1:40.00 |
| 2 | 10 | Euron Fon JONES | 12 | Nofio P.B.P | 1:37.20 |
| 3 | 12 | Ellis HARGREAVES | 12 | Co Leeds | 1:34.67 |
| 4 | 14 | Frederick GREENWOOD | 11 | Co Sheffield | 1:34.35 |
| 5 | 13 | Steffan Iolo WILLIAMS | 13 | Nofio P.B.P | 1:34.50 |
| 6 | 11 | Reuben BARKER | 9 | Co Leeds | 1:35.92 |
| 7 | 9 | Ezel KAFTAR | 12 | Wetherby | 1:38.80 |
| 8 | 7 | Ollie FOTHERGILL | 9 | Co Sheffield | 1:40.09 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Eddie SMITH | 10 | Co Sheffield | 1:32.46 |
| 2 | 18 | Samuel FORD | 10 | Co Leeds | 1:31.44 |
| 3 | 20 | Michal MROZINSKI | 11 | Conwy | 1:30.80 |
| 4 | 22 | Lewis LUNG | 10 | Co Leeds | 1:29.20 |
| 5 | 21 | Oscar CALAM | 10 | Co Leeds | 1:30.48 |
| 6 | 19 | Ioan AP ROBERT | 13 | Nofio P.B.P | 1:30.80 |
| 7 | 17 | Noah SHEPHARD | 12 | Co Sheffield | 1:31.80 |
| 8 | 15 | Theo SIRA | 10 | Co Leeds | 1:32.48 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 24 | Matthew OGBUAGU | 12 | Co Leeds | 1:27.70 |
| 2 | 26 | Euan CARMODY | 10 | Co Leeds | 1:26.99 |
| 3 | 28 | Tomas BICKERS | 12 | Co Leeds | 1:26.18 |
| 4 | 30 | Jacob JONES | 12 | Co Leeds | 1:25.41 |
| 5 | 29 | George KING | 11 | Co Leeds | 1:26.10 |
| 6 | 27 | Isaac ROBINSON | 10 | Co Sheffield | 1:26.23 |
| 7 | 25 | Barney HOBBS | 11 | Co Leeds | 1:27.20 |
| 8 | 23 | Zac Anthony GRANT | 11 | Nofio P.B.P | 1:28.70 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 32 | Angus YOUNG | 12 | Co Leeds | 1:23.41 |
| 2 | 34 | Harry DIXON | 10 | Co Leeds | 1:22.84 |
| 3 | 36 | Demilade AYEMOWA | 13 | Co Leeds | 1:22.58 |
| 4 | 38 | Hogan LAM | 12 | Co Leeds | 1:21.30 |
| 5 | 37 | Mason CAMERON | 13 | Co Sheffield | 1:21.62 |
| 6 | 35 | Benjamin CLARK | 12 | Co Leeds | 1:22.71 |
| 7 | 33 | Tyler RAVEN | 11 | Co Leeds | 1:23.31 |
| 8 | 31 | Zachary WHITTAKER | 11 | Co Leeds | 1:23.44 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 40 | Oliver BARKER | 11 | Co Leeds | 1:20.99 |
| 2 | 42 | Harrison LEONARD | 12 | Conwy | 1:19.30 |
| 3 | 44 | William DUNN | 13 | Co Leeds | 1:17.78 |
| 4 | 46 | Oliver ATHA | 12 | Co Leeds | 1:17.25 |
| 5 | 45 | Jeffrey LANGE | 12 | Co Leeds | 1:17.31 |
| 6 | 43 | Oscar O'DONNELL | 12 | Co Leeds | 1:18.09 |
| 7 | 41 | Oscar HUSSEY | 12 | Co Leeds | 1:20.49 |
| 8 | 39 | Zac JONES | 13 | Chadderton | 1:21.20 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 48 | Now PARRY | 14 | Caernarfon | 1:16.50 |
| 2 | 50 | Jackson CLARKE | 14 | Co Leeds | 1:15.97 |
| 3 | 52 | Patrick O'HARA | 13 | Co Leeds | 1:09.63 |
| 4 | 54 | Tomos OWEN | 17 | Caernarfon | 1:05.05 |
| 5 | 53 | James WREN | 16 | Connahs Quay | 1:07.20 |
| 6 | 51 | Matei STOICESCU | 14 | Co Leeds | 1:11.28 |
| 7 | 49 | Lewis DAVIES | 14 | Nofio P.B.P | 1:16.00 |
| 8 | 47 | Alfie CRAGGS | 13 | Co Leeds | 1:16.66 |