EVENT 503 Open/Male 10 /Over 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Freddie HIRST | 10 | Grantham | 1:40.61 |
| 3 | 4 | Dan PALMER | 11 | Co Lincoln P | 1:31.47 |
| 4 | 6 | Joshua KIM | 12 | Grantham | 1:30.88 |
| 5 | 5 | Elliot GLEAVE | 11 | Grantham | 1:31.16 |
| 6 | 3 | Thomas VERE | 10 | South Lincs | 1:35.18 |
| 7 | 1 | Barnaby DURANT | 11 | Grantham | 1:40.67 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Thomas HILLSON | 11 | Grantham | 1:28.85 |
| 2 | 10 | Ryan ANDERSON | 13 | Gainsborough | 1:25.73 |
| 3 | 12 | Finley ROWDING | 13 | Co Lincoln P | 1:24.12 |
| 4 | 14 | Oliver CLARKE | 12 | Deepings | 1:23.40 |
| 5 | 13 | Joel SADLER | 13 | Grantham | 1:23.89 |
| 6 | 11 | Harry ELLIS | 13 | Louth | 1:25.14 |
| 7 | 9 | Bobby WALLIS | 12 | Co Lincoln P | 1:27.88 |
| 8 | 7 | Oscar WOOD | 11 | Lincoln Vulc | 1:29.97 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Henry SEAGROATT | 13 | Louth | 1:22.56 |
| 2 | 18 | Luca HALLAM | 12 | Grantham | 1:21.52 |
| 3 | 20 | Cole COOPER | 12 | Co Lincoln P | 1:21.24 |
| 4 | 22 | Noah SKINNER | 13 | Deepings | 1:20.48 |
| 5 | 21 | Oliver WILKINSON | 12 | Lincoln Vulc | 1:20.69 |
| 6 | 19 | Dominic MCLAUGHLIN | 13 | Louth | 1:21.26 |
| 7 | 17 | Zachary WILSON | 12 | Lincoln Vulc | 1:21.84 |
| 8 | 15 | Oscar DURANT | 13 | Grantham | 1:22.66 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 24 | Francesco MONACO | 12 | South Lincs | 1:18.68 |
| 2 | 27 | Jack HATCH | 14 | Gainsborough | 1:16.96 |
| 3 | 29 | James THOMAS | 14 | Gainsborough | 1:15.54 |
| 4 | 31 | Jack BELL | 15 | Deepings | 1:14.32 |
| 5 | 30 | Kieran LUCY | 14 | South Lincs | 1:15.12 |
| 6 | 28 | James HUCKLE | 13 | Lincoln Vulc | 1:16.29 |
| 7 | 25 | Jacob GIFFORD | 14 | Louth | 1:18.21 |
| 8 | 23 | Henry MASON-SMITH | 13 | Louth | 1:19.36 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 33 | Oliver JONES | 15 | Lincoln Vulc | 1:13.88 |
| 2 | 35 | Oliver GARNER | 14 | Co Lincoln P | 1:13.03 |
| 3 | 37 | Matthew TOMPKINSON | 15 | Louth | 1:12.62 |
| 4 | 39 | Luke DAYBELL | 15 | Grantham | 1:12.35 |
| 5 | 38 | James CASH | 14 | Deepings | 1:12.38 |
| 6 | 36 | Jacob HEGG | 14 | Lincoln Vulc | 1:12.93 |
| 7 | 34 | Aaron SADLER | 14 | South Lincs | 1:13.68 |
| 8 | 32 | James NICHOLS | 15 | Grantham | 1:14.24 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 43 | Bradley HOLLAND | 16 | South Lincs | 1:10.56 |
| 2 | 49 | Oliver SEALEY | 16 | Louth | 1:08.71 |
| 3 | 55 | Christian O'MALLEY | 18 | Lincoln Vulc | 1:06.61 |
| 4 | 61 | Owen HATHWAY | 18 | Grantham | 1:02.01 |
| 5 | 58 | Daniel DEGNAN | 16 | Grantham | 1:04.58 |
| 6 | 52 | Evan NOORPURI | 17 | Lincoln Vulc | 1:07.50 |
| 7 | 46 | Ben CARLYLE | 14 | Grantham | 1:10.20 |
| 8 | 40 | Charlie BISBY | 13 | South Lincs | 1:11.63 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 44 | Jack HICKS | 15 | Lincoln Vulc | 1:10.42 |
| 2 | 50 | Matteo MONACO | 15 | South Lincs | 1:07.89 |
| 3 | 56 | Jack HUGHES | 17 | Lincoln Vulc | 1:04.96 |
| 4 | 62 | Joshua CLARKE | 16 | Grantham | 1:00.88 |
| 5 | 59 | Jack ZERAVICA | 16 | Grantham | 1:03.91 |
| 6 | 53 | Leon BAILEY | 18 | Louth | 1:07.21 |
| 7 | 47 | William TAYLOR | 16 | Louth | 1:10.01 |
| 8 | 41 | Benjamin DERBY | 16 | Lincoln Vulc | 1:11.06 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 45 | Morgan FARRAR | 15 | Co Lincoln P | 1:10.22 |
| 2 | 51 | Layton ANNISON-SNOWDEN | 15 | Louth | 1:07.51 |
| 3 | 57 | Jacob FISH | 15 | Grantham | 1:04.65 |
| 4 | 63 | Ethan RICHES | 21 | Co Lincoln P | 56.76 |
| 5 | 60 | Jensen HYLTON | 16 | Co Lincoln P | 1:02.60 |
| 6 | 54 | Daniel HEPPLESTONE | 14 | Co Lincoln P | 1:07.17 |
| 7 | 48 | Lucas NEWBOULT | 15 | Lincoln Vulc | 1:08.72 |
| 8 | 42 | Zach HOPKINSON | 15 | Grantham | 1:10.92 |