EVENT 404 Mixed 200m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Evangeline KINNEAR | 11 | Grantham | 5:01.00 |
| 2 | 2 | Benjamin SHEARN | 10 | Grantham | 5:00.00 |
| 3 | 3 | Francesca MORGAN | 11 | Grantham | 5:00.00 |
| 4 | 4 | Abigail TAYLOR | 10 | Grantham | 4:40.19 |
| 5 | 5 | Emmeline GLEAVE | 9 | Grantham | 4:05.00 |
| 6 | 6 | Madeline SURTEES | 12 | Grantham | 3:52.01 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Ruby NISBET | 10 | Grantham | 3:48.45 |
| 2 | 8 | Thomas KINNEAR | 13 | Grantham | 3:39.40 |
| 3 | 9 | Benjamin GODDARD | 11 | Grantham | 3:34.12 |
| 4 | 10 | Derrin BROCKLEBANK | 10 | Grantham | 3:32.38 |
| 5 | 11 | Juliette KIM | 9 | Grantham | 3:30.00 |
| 6 | 12 | Hollie-Anne CROOK | 10 | Grantham | 3:28.86 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 13 | Ava-Grace GREGORY | 12 | Grantham | 3:26.47 |
| 2 | 14 | Freddie HIRST | 10 | Grantham | 3:25.80 |
| 3 | 15 | Markas PARAPIJONAVICIU | 11 | Grantham | 3:25.19 |
| 4 | 16 | Ella KHAMA | 10 | Grantham | 3:20.56 |
| 5 | 17 | Octavia SHEARN | 12 | Grantham | 3:20.33 |
| 6 | 18 | Elliot GLEAVE | 11 | Grantham | 3:17.84 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | Jimmin BAO | 11 | Grantham | 3:17.84 |
| 2 | 20 | Elisabeth KINNEAR | 14 | Grantham | 3:16.70 |
| 3 | 21 | Henry DOLAN | 11 | Grantham | 3:16.05 |
| 4 | 22 | George LEONARD | 12 | Grantham | 3:13.17 |
| 5 | 23 | Toby EDMONDSON | 10 | Grantham | 3:11.18 |
| 6 | 24 | Thomas HILLSON | 11 | Grantham | 3:08.69 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 25 | Fabian KOLASA | 13 | Grantham | 3:07.63 |
| 2 | 26 | Mia PARAPIJONAVICIUTE | 15 | Grantham | 3:05.32 |
| 3 | 27 | Lucy ABBOTT | 12 | Grantham | 3:03.08 |
| 4 | 28 | Lexie SHEWAN | 14 | Grantham | 3:00.42 |
| 5 | 29 | Annie WEBSTER | 12 | Grantham | 3:00.24 |
| 6 | 30 | Grace HOWITT | 15 | Grantham | 2:58.40 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Lizzy LERESCHE HANDS | 13 | Grantham | 2:56.47 |
| 2 | 32 | Elena ALDENHOFF-KELLY | 16 | Grantham | 2:52.78 |
| 3 | 33 | Annabelle JAY | 13 | Grantham | 2:50.39 |
| 4 | 34 | Harriet MCCORMACK | 15 | Grantham | 2:48.04 |
| 5 | 35 | Ellena HOWITT | 13 | Grantham | 2:43.91 |
| 6 | 36 | Lucy WILLATTS | 13 | Grantham | 2:43.61 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 37 | Amy TAYLOR | 13 | Grantham | 2:43.47 |
| 2 | 38 | Ben CARLYLE | 14 | Grantham | 2:43.40 |
| 3 | 39 | Isobel ALLSOP | 14 | Grantham | 2:43.33 |
| 4 | 40 | Sophie WARD | 15 | Grantham | 2:41.86 |
| 5 | 41 | Emilie WEBB | 14 | Grantham | 2:40.96 |
| 6 | 42 | Isla GRAY | 14 | Grantham | 2:38.31 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 44 | Grace TURNER | 17 | Grantham | 2:28.49 |
| 2 | 46 | Zach HOPKINSON | 15 | Grantham | 2:23.24 |
| 3 | 48 | Benjamin ROBERTS | 15 | Grantham | 2:13.37 |
| 4 | 47 | Jacob FISH | 15 | Grantham | 2:17.99 |
| 5 | 45 | Daniel DEGNAN | 16 | Grantham | 2:26.60 |
| 6 | 43 | Megan BROWN | 15 | Grantham | 2:30.60 |