EVENT 105 Mixed 200m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Cyril BAO | 9 | Grantham | |
| 2 | 2 | Tilly WASKETT-BOOTH | 9 | Grantham | |
| 3 | 3 | Ada PAGE | 9 | Grantham | |
| 4 | 4 | George DOLAN | 9 | Grantham | |
| 5 | 5 | Poppy BRODIE | 13 | Grantham | 4:15.17 |
| 6 | 6 | Abigail TAYLOR | 11 | Grantham | 4:03.39 |
| 7 | 7 | Daniel GODDARD | 10 | Grantham | 3:50.38 |
| 8 | 8 | Gracie PAYNE | 12 | Grantham | 3:50.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | Hannah EXLEY | 11 | Grantham | 3:50.00 |
| 2 | 10 | Esmé EVANS | 11 | Grantham | 3:50.00 |
| 3 | 11 | Matilda MCDONNELL | 12 | Grantham | 3:43.95 |
| 4 | 12 | Louis THOMPSON | 10 | Grantham | 3:40.00 |
| 5 | 13 | Francesca WESTON | 10 | Grantham | 3:40.00 |
| 6 | 14 | Emmeline GLEAVE | 10 | Grantham | 3:36.12 |
| 7 | 15 | Annabel HILLSON | 10 | Grantham | 3:30.00 |
| 8 | 16 | Juliette KIM | 10 | Grantham | 3:25.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 17 | Austin CHEN-REES | 12 | Grantham | 3:25.00 |
| 2 | 18 | Madeline SURTEES | 13 | Grantham | 3:17.89 |
| 3 | 19 | Freddie HIRST | 11 | Grantham | 3:16.43 |
| 4 | 20 | Leo BARNETT | 13 | Grantham | 3:10.11 |
| 5 | 21 | Louis WRIGHT | 12 | Grantham | 3:10.00 |
| 6 | 22 | Hollie-Ann CROOK | 11 | Grantham | 3:09.62 |
| 7 | 23 | Derrin BROCKLEBANK | 11 | Grantham | 3:09.54 |
| 8 | 24 | Ella KHAMA | 11 | Grantham | 3:08.58 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 25 | Octavia SHEARN | 13 | Grantham | 3:06.01 |
| 2 | 26 | Isabelle CLAYTON | 13 | Grantham | 3:05.46 |
| 3 | 27 | Elliot GLEAVE | 12 | Grantham | 3:05.16 |
| 4 | 28 | Jimmin BAO | 12 | Grantham | 3:04.22 |
| 5 | 29 | Mia PARAPIJONAVICIUTE | 16 | Grantham | 3:02.11 |
| 6 | 30 | Markas PARAPIJONAVICIU | 12 | Grantham | 2:58.50 |
| 7 | 31 | Joshua KIM | 13 | Grantham | 2:57.37 |
| 8 | 32 | George LEONARD | 13 | Grantham | 2:51.65 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 33 | Grace HOWITT | 16 | Grantham | 2:50.41 |
| 2 | 34 | Lucy ABBOTT | 13 | Grantham | 2:49.36 |
| 3 | 35 | Elena ALDENHOFF-KELLY | 17 | Grantham | 2:48.35 |
| 4 | 36 | Alfie HAIGH | 16 | Grantham | 2:45.03 |
| 5 | 37 | Lexie SHEWAN | 15 | Grantham | 2:44.12 |
| 6 | 38 | Thomas HILLSON | 12 | Grantham | 2:42.31 |
| 7 | 39 | Amy TAYLOR | 14 | Grantham | 2:38.80 |
| 8 | 40 | Ellena HOWITT | 14 | Grantham | 2:38.20 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 42 | Isobel ALLSOP | 15 | Grantham | 2:31.20 |
| 2 | 44 | Chloe HOPKINSON | 20 | Grantham | 2:28.75 |
| 3 | 46 | Jacob FISH | 16 | Grantham | 2:17.51 |
| 4 | 48 | Joshua CLARKE | 17 | Grantham | 1:59.00 |
| 5 | 47 | Ben CARLYLE | 15 | Grantham | 2:07.37 |
| 6 | 45 | Annabelle JAY | 14 | Grantham | 2:28.60 |
| 7 | 43 | Lucy WILLATTS | 14 | Grantham | 2:30.14 |
| 8 | 41 | Jessica - Rose DAVISON | 16 | Grantham | 2:36.61 |