EVENT 103 Mixed 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Poppy BRODIE | 12 | Grantham | 2:22.75 |
| 3 | 2 | Lara HATTON | 9 | Grantham | 2:20.00 |
| 4 | 3 | Annabel HILLSON | 9 | Grantham | 2:09.51 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | Evangeline KINNEAR | 11 | Grantham | 2:08.86 |
| 2 | 5 | Emmeline GLEAVE | 9 | Grantham | 2:08.38 |
| 3 | 6 | Honey FLOWER | 10 | Grantham | 2:04.94 |
| 4 | 7 | Thomas HILLSON | 11 | Grantham | 2:04.62 |
| 5 | 8 | Louis WRIGHT | 11 | Grantham | 2:03.85 |
| 6 | 9 | Abigail TAYLOR | 10 | Grantham | 2:02.63 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Emily CLAYTON | 10 | Grantham | 2:02.06 |
| 2 | 11 | Madeline SURTEES | 12 | Grantham | 1:57.36 |
| 3 | 12 | Hollie-Anne CROOK | 10 | Grantham | 1:53.00 |
| 4 | 13 | Juliette KIM | 9 | Grantham | 1:50.00 |
| 5 | 14 | Helena HAMILTON | 13 | Grantham | 1:48.16 |
| 6 | 15 | Markas PARAPIJONAVICIU | 11 | Grantham | 1:47.85 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Lexie SHEWAN | 14 | Grantham | 1:47.82 |
| 2 | 17 | Jake MCGHEE | 14 | Grantham | 1:47.29 |
| 3 | 18 | Joshua KIM | 12 | Grantham | 1:47.26 |
| 4 | 19 | Octavia SHEARN | 12 | Grantham | 1:47.14 |
| 5 | 20 | Elliot GLEAVE | 11 | Grantham | 1:47.01 |
| 6 | 21 | Freddie HIRST | 10 | Grantham | 1:47.00 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 22 | Elisabeth KINNEAR | 14 | Grantham | 1:46.69 |
| 2 | 23 | Derrin BROCKLEBANK | 10 | Grantham | 1:46.27 |
| 3 | 24 | Leo BARNETT | 12 | Grantham | 1:45.17 |
| 4 | 25 | Ava-Grace GREGORY | 12 | Grantham | 1:44.63 |
| 5 | 26 | Isabelle CLAYTON | 12 | Grantham | 1:44.53 |
| 6 | 27 | Thomas KINNEAR | 13 | Grantham | 1:44.00 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 28 | George LEONARD | 12 | Grantham | 1:43.90 |
| 2 | 29 | Arthur BREARLEY-NEWSOM | 13 | Grantham | 1:41.97 |
| 3 | 30 | Ella KHAMA | 10 | Grantham | 1:41.27 |
| 4 | 31 | Fabian KOLASA | 13 | Grantham | 1:39.60 |
| 5 | 32 | Hannah DOBNEY | 15 | Grantham | 1:39.51 |
| 6 | 33 | Lucy ABBOTT | 12 | Grantham | 1:37.28 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 34 | Henry DOLAN | 11 | Grantham | 1:37.01 |
| 2 | 35 | Ellena HOWITT | 13 | Grantham | 1:34.79 |
| 3 | 36 | Mia PARAPIJONAVICIUTE | 15 | Grantham | 1:33.12 |
| 4 | 37 | Elena ALDENHOFF-KELLY | 16 | Grantham | 1:33.09 |
| 5 | 38 | Lizzy LERESCHE HANDS | 13 | Grantham | 1:32.81 |
| 6 | 39 | Alfie HAIGH | 15 | Grantham | 1:32.41 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 40 | Ben CARLYLE | 14 | Grantham | 1:32.38 |
| 2 | 41 | Jessica - Rose DAVISON | 15 | Grantham | 1:32.13 |
| 3 | 42 | Lucy WILLATTS | 13 | Grantham | 1:30.48 |
| 4 | 43 | Daisy CANTILLON | 12 | Grantham | 1:30.00 |
| 5 | 44 | Annabelle JAY | 13 | Grantham | 1:29.28 |
| 6 | 45 | Amy TAYLOR | 13 | Grantham | 1:25.43 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 46 | Sophie WARD | 15 | Grantham | 1:23.39 |
| 2 | 47 | Megan BROWN | 15 | Grantham | 1:22.02 |
| 3 | 48 | Emilie WEBB | 14 | Grantham | 1:21.85 |
| 4 | 49 | Grace TURNER | 17 | Grantham | 1:20.47 |
| 5 | 50 | Adam FOUND | 27 | Grantham | 1:20.00 |
| 6 | 51 | Daniel DEGNAN | 16 | Grantham | 1:19.01 |
| Heat Number - 10 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 53 | Jacob FISH | 15 | Grantham | 1:12.24 |
| 2 | 55 | Zach HOPKINSON | 15 | Grantham | 1:09.90 |
| 3 | 57 | Benjamin ROBERTS | 15 | Grantham | 1:07.64 |
| 4 | 56 | George BERWICK | 21 | Grantham | 1:08.51 |
| 5 | 54 | Jack ZERAVICA | 16 | Grantham | 1:11.63 |
| 6 | 52 | James NICHOLS | 15 | Grantham | 1:18.90 |