EVENT 16 Boy Open 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Oliver WILKINSON | 9 | Lincoln Vulc | 2:20.00 |
| 4 | 3 | Oliver CLARKE | 9 | Deepings | 2:14.82 |
| 5 | 5 | Robbie DUFF | 10 | Lincoln Vulc | 2:10.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Oliver BERTIE-SMITH | 11 | Louth | 2:05.90 |
| 2 | 7 | Ethan DERBY | 11 | Lincoln Vulc | 1:57.89 |
| 3 | 8 | Thomas BURDOCK | 11 | Deepings | 1:57.00 |
| 4 | 9 | Alfie HAIGH | 13 | Grantham | 1:50.00 |
| 5 | 10 | Samuel O'HANLON | 16 | Deepings | 1:47.40 |
| 6 | 11 | Oscar DURANT | 11 | Grantham | 1:41.96 |
| 7 | 12 | Henry BUCKLEY | 13 | Louth | 1:39.22 |
| 8 | 13 | James CASH | 12 | Deepings | 1:35.69 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | Jacob GIFFORD | 11 | Lincoln Vulc | 1:34.87 |
| 2 | 15 | Joel SADLER | 11 | Grantham | 1:33.34 |
| 3 | 16 | Lewis SNOWSHALL | 12 | Lincoln Vulc | 1:33.27 |
| 4 | 17 | Oscar BROWN | 13 | Loughborough | 1:33.09 |
| 5 | 18 | Adrian ELERTS | 12 | Grantham | 1:32.59 |
| 6 | 19 | Luke DAYBELL | 12 | Grantham | 1:30.70 |
| 7 | 20 | Theo BACON | 11 | Grantham | 1:30.00 |
| 8 | 21 | Henry SEAGROATT | 11 | Louth | 1:29.98 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 22 | Ashton HUNTER | 9 | Deepings | 1:28.95 |
| 2 | 23 | Tyler MORRIS | 14 | Lincoln Vulc | 1:28.54 |
| 3 | 25 | Sam NGUYEN | 12 | Lincoln Vulc | 1:25.00 |
| 4 | 26 | William BURDOCK | 12 | Deepings | 1:24.60 |
| 5 | 27 | Ridas RABASAUSKAS | 13 | Grantham | 1:23.68 |
| 6 | 28 | Daniel HEPPLESTONE | 11 | Lincoln Vulc | 1:21.71 |
| 7 | 29 | Lewis TARVER | 13 | Deepings | 1:21.30 |
| 8 | 30 | Harrison BYWATER | 14 | Loughborough | 1:21.10 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Oliver JONES | 13 | Lincoln Vulc | 1:20.21 |
| 2 | 32 | Matthew TOMPKINSON | 12 | Louth | 1:20.19 |
| 3 | 33 | Theo SIDDORN | 14 | Louth | 1:19.93 |
| 4 | 34 | Jack HICKS | 12 | Lincoln Vulc | 1:18.05 |
| 5 | 35 | Jake ADAMS | 14 | Louth | 1:16.73 |
| 6 | 36 | Jacob FISH | 12 | Grantham | 1:16.05 |
| 7 | 37 | Zach HOPKINSON | 13 | Grantham | 1:15.14 |
| 8 | 38 | Jack HUGHES | 14 | Lincoln Vulc | 1:13.70 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 40 | Evan NOORPURI | 15 | Lincoln Vulc | 1:12.98 |
| 2 | 42 | Reuben TAYLOR | 15 | Loughborough | 1:11.63 |
| 3 | 45 | Cade DEAVES | 16 | Grantham | 1:05.94 |
| 4 | 47 | Owen HATHWAY | 15 | Grantham | 1:04.99 |
| 5 | 46 | Jack GOLDFINCH | 16 | Loughborough | 1:05.18 |
| 6 | 44 | Jack ZERAVICA | 14 | Grantham | 1:09.75 |
| 7 | 41 | Daniel DEGNAN | 13 | Grantham | 1:12.85 |
| 8 | 39 | William TAYLOR | 14 | Louth | 1:13.66 |