EVENT 201 Mixed 200m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Cyril BAO | 9 | Grantham | |
| 4 | 2 | George DOLAN | 9 | Grantham | |
| 5 | 3 | Ada PAGE | 9 | Grantham | 4:29.39 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 4 | Abigail TAYLOR | 11 | Grantham | 4:18.12 |
| 3 | 5 | Evangeline KINNEAR | 12 | Grantham | 4:13.57 |
| 4 | 6 | Evelyn NICHOLLS | 12 | Grantham | 4:11.47 |
| 5 | 7 | Matilda MCDONNELL | 12 | Grantham | 4:09.03 |
| 6 | 8 | William PENNOCK | 11 | Grantham | 4:04.92 |
| 7 | 9 | Emily CLAYTON | 11 | Grantham | 4:03.89 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Tilly WASKETT-BOOTH | 9 | Grantham | 4:03.73 |
| 2 | 11 | Annabel HILLSON | 10 | Grantham | 4:01.36 |
| 3 | 12 | Benjamin SHEARN | 11 | Grantham | 4:00.65 |
| 4 | 13 | Hannah EXLEY | 11 | Grantham | 4:00.00 |
| 5 | 14 | Poppy BRODIE | 13 | Grantham | 4:00.00 |
| 6 | 15 | Francesca WESTON | 10 | Grantham | 4:00.00 |
| 7 | 16 | Esmé EVANS | 11 | Grantham | 4:00.00 |
| 8 | 17 | Gracie PAYNE | 12 | Grantham | 4:00.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Louis THOMPSON | 10 | Grantham | 4:00.00 |
| 2 | 19 | Madeline SURTEES | 13 | Grantham | 3:52.52 |
| 3 | 20 | Derrin BROCKLEBANK | 11 | Grantham | 3:52.10 |
| 4 | 21 | Honey FLOWER | 11 | Grantham | 3:50.00 |
| 5 | 22 | Lucia CORTON | 10 | Grantham | 3:50.00 |
| 6 | 23 | Emmeline GLEAVE | 10 | Grantham | 3:47.20 |
| 7 | 24 | Octavia SHEARN | 13 | Grantham | 3:44.58 |
| 8 | 25 | Freddie HIRST | 11 | Grantham | 3:40.63 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 26 | Ava-Grace GREGORY | 13 | Grantham | 3:37.97 |
| 2 | 27 | Ella KHAMA | 11 | Grantham | 3:37.06 |
| 3 | 28 | Joshua KIM | 13 | Grantham | 3:36.17 |
| 4 | 29 | Leo BARNETT | 13 | Grantham | 3:36.02 |
| 5 | 30 | Austin CHEN-REES | 12 | Grantham | 3:35.00 |
| 6 | 31 | Elisabeth KINNEAR | 15 | Grantham | 3:34.02 |
| 7 | 32 | Juliette KING | 13 | Grantham | 3:33.95 |
| 8 | 33 | Isabelle CLAYTON | 13 | Grantham | 3:26.76 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 34 | George LEONARD | 13 | Grantham | 3:26.30 |
| 2 | 35 | Louis WRIGHT | 12 | Grantham | 3:26.26 |
| 3 | 36 | Thomas KINNEAR | 14 | Grantham | 3:25.73 |
| 4 | 37 | Jimmin BAO | 12 | Grantham | 3:25.11 |
| 5 | 38 | Elliot GLEAVE | 12 | Grantham | 3:24.17 |
| 6 | 39 | Elena ALDENHOFF-KELLY | 17 | Grantham | 3:24.16 |
| 7 | 40 | Lucy ABBOTT | 13 | Grantham | 3:22.93 |
| 8 | 41 | Ellena HOWITT | 14 | Grantham | 3:21.46 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 42 | Grace HOWITT | 16 | Grantham | 3:20.74 |
| 2 | 43 | Mia PARAPIJONAVICIUTE | 16 | Grantham | 3:13.87 |
| 3 | 44 | Arthur BREARLEY-NEWSOM | 14 | Grantham | 3:13.83 |
| 4 | 45 | Markas PARAPIJONAVICIU | 12 | Grantham | 3:12.00 |
| 5 | 46 | Henry DOLAN | 12 | Grantham | 3:11.66 |
| 6 | 47 | Lucy WILLATTS | 14 | Grantham | 3:02.19 |
| 7 | 48 | Amy TAYLOR | 14 | Grantham | 3:00.55 |
| 8 | 49 | Ben CARLYLE | 15 | Grantham | 2:57.48 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 51 | Isobel ALLSOP | 15 | Grantham | 2:55.60 |
| 2 | 53 | Isla GRAY | 15 | Grantham | 2:50.93 |
| 3 | 55 | Jacob FISH | 16 | Grantham | 2:35.15 |
| 4 | 57 | Zach HOPKINSON | 16 | Grantham | 2:26.81 |
| 5 | 56 | James DOBNEY | 21 | Grantham | 2:31.98 |
| 6 | 54 | Chloe HOPKINSON | 20 | Grantham | 2:49.58 |
| 7 | 52 | Sophie WARD | 16 | Grantham | 2:52.84 |
| 8 | 50 | Annabelle JAY | 14 | Grantham | 2:57.06 |