EVENT 101 Mixed 200m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Abigail TAYLOR | 10 | Grantham | 4:30.00 |
| 2 | 2 | Evangeline KINNEAR | 11 | Grantham | 4:10.00 |
| 3 | 3 | Thomas KINNEAR | 13 | Grantham | 3:53.98 |
| 4 | 4 | Madeline SURTEES | 12 | Grantham | 3:48.79 |
| 5 | 5 | Henry DOLAN | 11 | Grantham | 3:43.96 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Hollie-Anne CROOK | 10 | Grantham | 3:30.54 |
| 2 | 7 | Octavia SHEARN | 12 | Grantham | 3:28.61 |
| 3 | 8 | George LEONARD | 12 | Grantham | 3:27.51 |
| 4 | 9 | Freddie HIRST | 10 | Grantham | 3:25.89 |
| 5 | 10 | Leo BARNETT | 12 | Grantham | 3:21.46 |
| 6 | 11 | Derrin BROCKLEBANK | 10 | Grantham | 3:20.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | Elliot GLEAVE | 11 | Grantham | 3:10.48 |
| 2 | 13 | Ella KHAMA | 10 | Grantham | 3:10.00 |
| 3 | 14 | Joshua KIM | 12 | Grantham | 3:07.45 |
| 4 | 15 | Elisabeth KINNEAR | 14 | Grantham | 3:05.20 |
| 5 | 16 | Markas PARAPIJONAVICIU | 11 | Grantham | 3:04.00 |
| 6 | 17 | Mia PARAPIJONAVICIUTE | 15 | Grantham | 3:00.55 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Daisy CANTILLON | 12 | Grantham | 3:00.01 |
| 2 | 19 | Thomas HILLSON | 11 | Grantham | 2:59.79 |
| 3 | 20 | Lucy ABBOTT | 12 | Grantham | 2:55.29 |
| 4 | 21 | Annabelle JAY | 13 | Grantham | 2:52.46 |
| 5 | 22 | Amy TAYLOR | 13 | Grantham | 2:50.55 |
| 6 | 23 | Lexie SHEWAN | 14 | Grantham | 2:50.44 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 24 | Grace HOWITT | 15 | Grantham | 2:49.01 |
| 2 | 25 | Elena ALDENHOFF-KELLY | 16 | Grantham | 2:48.49 |
| 3 | 26 | Alfie HAIGH | 15 | Grantham | 2:47.13 |
| 4 | 27 | Ellena HOWITT | 13 | Grantham | 2:43.63 |
| 5 | 28 | Emilie WEBB | 14 | Grantham | 2:36.88 |
| 6 | 29 | Jessica - Rose DAVISON | 15 | Grantham | 2:36.61 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Ben CARLYLE | 14 | Grantham | 2:29.20 |
| 2 | 33 | Grace TURNER | 17 | Grantham | 2:24.65 |
| 3 | 35 | Jacob FISH | 15 | Grantham | 2:17.51 |
| 4 | 34 | Daniel DEGNAN | 16 | Grantham | 2:20.45 |
| 5 | 32 | Zach HOPKINSON | 15 | Grantham | 2:28.83 |
| 6 | 30 | Lucy WILLATTS | 13 | Grantham | 2:36.20 |