EVENT 305 Mixed 200m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | George DOLAN | 9 | Grantham | |
| 3 | 2 | Emily CLAYTON | 11 | Grantham | 4:05.61 |
| 4 | 3 | Hannah EXLEY | 11 | Grantham | 4:00.00 |
| 5 | 4 | Louis THOMPSON | 10 | Grantham | 4:00.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Lucia CORTON | 10 | Grantham | 4:00.00 |
| 2 | 6 | Gracie PAYNE | 12 | Grantham | 4:00.00 |
| 3 | 7 | Evelyn NICHOLLS | 12 | Grantham | 3:56.43 |
| 4 | 8 | Thomas WHITTLE | 13 | Grantham | 3:55.47 |
| 5 | 9 | Tilly WASKETT-BOOTH | 9 | Grantham | 3:52.63 |
| 6 | 10 | Francesca WESTON | 10 | Grantham | 3:50.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Esmé EVANS | 11 | Grantham | 3:50.00 |
| 2 | 12 | Annabel HILLSON | 10 | Grantham | 3:50.00 |
| 3 | 13 | Abigail TAYLOR | 11 | Grantham | 3:46.45 |
| 4 | 14 | Cyril BAO | 9 | Grantham | 3:44.55 |
| 5 | 15 | William PENNOCK | 11 | Grantham | 3:30.22 |
| 6 | 16 | Austin CHEN-REES | 12 | Grantham | 3:30.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 17 | Olivia CHARITY | 13 | Grantham | 3:28.25 |
| 2 | 18 | Emmeline GLEAVE | 10 | Grantham | 3:27.98 |
| 3 | 19 | Honey FLOWER | 11 | Grantham | 3:27.43 |
| 4 | 20 | Matilda MCDONNELL | 12 | Grantham | 3:26.05 |
| 5 | 21 | Benjamin SHEARN | 11 | Grantham | 3:25.10 |
| 6 | 22 | Florence HARPER | 12 | Grantham | 3:23.08 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | Madeline SURTEES | 13 | Grantham | 3:21.89 |
| 2 | 24 | Thomas KINNEAR | 14 | Grantham | 3:20.43 |
| 3 | 25 | Juliette KING | 13 | Grantham | 3:19.53 |
| 4 | 26 | Yu Ching (Eugene) CHEU | 14 | Grantham | 3:18.93 |
| 5 | 27 | Ava-Grace GREGORY | 13 | Grantham | 3:18.65 |
| 6 | 28 | Juliette KIM | 10 | Grantham | 3:17.94 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 29 | Octavia SHEARN | 13 | Grantham | 3:16.34 |
| 2 | 30 | Freddie HIRST | 11 | Grantham | 3:13.48 |
| 3 | 31 | Louis WRIGHT | 12 | Grantham | 3:09.34 |
| 4 | 32 | Ella KHAMA | 11 | Grantham | 3:09.05 |
| 5 | 33 | Hollie-Ann CROOK | 11 | Grantham | 3:06.39 |
| 6 | 34 | Elliot GLEAVE | 12 | Grantham | 3:04.16 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 35 | Isabelle CLAYTON | 13 | Grantham | 3:02.34 |
| 2 | 36 | Henry DOLAN | 12 | Grantham | 3:00.60 |
| 3 | 37 | Hannah DOBNEY | 16 | Grantham | 3:00.50 |
| 4 | 38 | George LEONARD | 13 | Grantham | 2:57.72 |
| 5 | 39 | Derrin BROCKLEBANK | 11 | Grantham | 2:57.57 |
| 6 | 40 | Elena ALDENHOFF-KELLY | 17 | Grantham | 2:56.97 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 41 | Mia PARAPIJONAVICIUTE | 16 | Grantham | 2:55.38 |
| 2 | 42 | Joshua KIM | 13 | Grantham | 2:55.07 |
| 3 | 43 | Jimmin BAO | 12 | Grantham | 2:53.97 |
| 4 | 44 | Lucy ABBOTT | 13 | Grantham | 2:52.35 |
| 5 | 45 | Toby EDMONDSON | 11 | Grantham | 2:52.17 |
| 6 | 46 | Grace HOWITT | 16 | Grantham | 2:51.78 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 47 | Lexie SHEWAN | 15 | Grantham | 2:49.79 |
| 2 | 48 | Thomas HILLSON | 12 | Grantham | 2:49.23 |
| 3 | 49 | Jessica - Rose DAVISON | 16 | Grantham | 2:46.47 |
| 4 | 50 | Markas PARAPIJONAVICIU | 12 | Grantham | 2:43.92 |
| 5 | 51 | Ellena HOWITT | 14 | Grantham | 2:43.91 |
| 6 | 52 | Isobel ALLSOP | 15 | Grantham | 2:41.68 |
| Heat Number - 10 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 53 | Sophie WARD | 16 | Grantham | 2:41.67 |
| 2 | 54 | Amy TAYLOR | 14 | Grantham | 2:41.03 |
| 3 | 55 | Lucy WILLATTS | 14 | Grantham | 2:37.33 |
| 4 | 56 | Annabelle JAY | 14 | Grantham | 2:33.18 |
| 5 | 57 | Isla GRAY | 15 | Grantham | 2:32.83 |
| 6 | 58 | Chloe HOPKINSON | 20 | Grantham | 2:32.64 |
| Heat Number - 11 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 60 | Zach HOPKINSON | 16 | Grantham | 2:18.78 |
| 2 | 62 | Ben CARLYLE | 15 | Grantham | 2:17.79 |
| 3 | 64 | Benjamin ROBERTS | 16 | Grantham | 2:07.02 |
| 4 | 63 | James DOBNEY | 21 | Grantham | 2:13.38 |
| 5 | 61 | Jacob FISH | 16 | Grantham | 2:17.99 |
| 6 | 59 | Luke DAYBELL | 16 | Grantham | 2:27.49 |