EVENT 405 Open/Male 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | B Cooper-Velthuijsen | 11 | Braunstone | 2:26.93 |
| 4 | 3 | Jack Jackson | 11 | Northampton | 1:49.58 |
| 5 | 2 | Cameron Redley | 10 | Northampton | 2:00.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 5 | Milan Rotgers | 10 | Northampton | 1:45.00 |
| 3 | 7 | Cohen Britton | 10 | Braunstone | 1:43.00 |
| 4 | 9 | Kayden Higgs | 12 | Northampton | 1:40.29 |
| 5 | 8 | Ethan Woodward | 13 | Northampton | 1:41.76 |
| 6 | 6 | Victor Puscasu | 11 | Northampton | 1:44.02 |
| 7 | 4 | Oliver Doran | 11 | Leic Peng | 1:46.06 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Henry Green | 13 | Braunstone | 1:39.97 |
| 2 | 13 | Eben Dodge | 11 | Braunstone | 1:38.35 |
| 3 | 15 | Kiril Moraru | 12 | Northampton | 1:37.40 |
| 4 | 17 | David Ursachi | 11 | Co Leicester | 1:34.25 |
| 5 | 16 | Niall Fryer-Hall | 11 | Leic Peng | 1:36.42 |
| 6 | 14 | Mason Wilmer | 11 | March | 1:38.22 |
| 7 | 12 | Fabian Borta | 13 | Northampton | 1:39.30 |
| 8 | 10 | Lucas Poole | 12 | Northampton | 1:40.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | Daniil Obuhov | 11 | Braunstone | 1:32.32 |
| 2 | 21 | Marius Bot | 12 | Leicester Ne | 1:27.52 |
| 3 | 23 | Ali Jamili | 12 | Co Leicester | 1:20.03 |
| 4 | 25 | Isaac Ebanks | 14 | Derby Excel | 1:18.87 |
| 5 | 24 | Luca Nuttall | 13 | Newport | 1:19.94 |
| 6 | 22 | V Bramley - Howell | 14 | Leic Peng | 1:20.81 |
| 7 | 20 | James Oscroft | 11 | Northampton | 1:29.60 |
| 8 | 18 | Andrei Obuhov | 13 | Braunstone | 1:33.11 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 27 | Harry Rickard | 14 | March | 1:17.67 |
| 2 | 29 | Kais Alhijazi | 13 | Co Leicester | 1:16.61 |
| 3 | 31 | Riley Woodward | 15 | Northampton | 1:15.35 |
| 4 | 33 | George Howard | 12 | Co Leicester | 1:12.88 |
| 5 | 32 | Emerson-Blu Gupwell | 14 | Co Leicester | 1:12.90 |
| 6 | 30 | Austin Graham | 12 | Co Leicester | 1:16.39 |
| 7 | 28 | Ollie Perrins | 12 | Loughborough | 1:17.54 |
| 8 | 26 | David Bielawski | 15 | Northampton | 1:18.15 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 35 | Lawrence Chapman | 16 | Worksop | 1:11.04 |
| 2 | 37 | Jack Robertson | 15 | Corby | 1:08.85 |
| 3 | 39 | Jacob Cutler | 16 | Worcester | 1:07.17 |
| 4 | 41 | Matthew Dizon | 17 | Co Leicester | 1:01.87 |
| 5 | 40 | James Frost | 17 | Newport | 1:03.44 |
| 6 | 38 | Gabriel Corbett | 14 | Leic Peng | 1:08.11 |
| 7 | 36 | Conner Munden | 17 | Northampton | 1:10.51 |
| 8 | 34 | Finlay Marsden | 15 | Worksop | 1:11.98 |