EVENT 202 Mixed 50m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Martha WOOD | 9 | Grantham | |
| 4 | 2 | Henry LEONARD | 9 | Grantham | |
| 5 | 3 | Ada PAGE | 9 | Grantham | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | George DOLAN | 9 | Grantham | |
| 2 | 5 | Willem POWELL-VREESWIJ | 10 | Grantham | 1:10.00 |
| 3 | 6 | Austin CHEN-REES | 12 | Grantham | 1:06.79 |
| 4 | 7 | Gracie PAYNE | 12 | Grantham | 1:05.00 |
| 5 | 8 | Louis THOMPSON | 10 | Grantham | 1:05.00 |
| 6 | 9 | Bethany MEAKIN | 11 | Grantham | 59.00 |
| 7 | 10 | Evie FELTON | 10 | Grantham | 59.00 |
| 8 | 11 | Norahh MOE-AUNG | 11 | Grantham | 59.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | Evelyn NICHOLLS | 12 | Grantham | 56.23 |
| 2 | 13 | Imogen GAUNT | 14 | Grantham | 56.00 |
| 3 | 14 | Georgia BELLETT | 10 | Grantham | 55.00 |
| 4 | 15 | Francesca WESTON | 10 | Grantham | 54.12 |
| 5 | 16 | Tilly WASKETT-BOOTH | 9 | Grantham | 54.11 |
| 6 | 17 | Evangeline KINNEAR | 12 | Grantham | 52.17 |
| 7 | 18 | Esmé EVANS | 11 | Grantham | 52.00 |
| 8 | 19 | Annabel HILLSON | 10 | Grantham | 51.26 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 20 | Lucia CORTON | 10 | Grantham | 50.77 |
| 2 | 21 | Hannah EXLEY | 11 | Grantham | 50.65 |
| 3 | 22 | Emily CLAYTON | 11 | Grantham | 50.13 |
| 4 | 23 | Yu Tsing (Trixie) CHEU | 12 | Grantham | 49.05 |
| 5 | 24 | Abigail TAYLOR | 11 | Grantham | 48.51 |
| 6 | 25 | Matilda MCDONNELL | 12 | Grantham | 45.57 |
| 7 | 26 | Madeline SURTEES | 13 | Grantham | 45.05 |
| 8 | 27 | William PENNOCK | 11 | Grantham | 44.84 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 28 | Honey FLOWER | 11 | Grantham | 44.55 |
| 2 | 29 | Elizabeth JONES | 15 | Grantham | 43.46 |
| 3 | 30 | Benjamin SHEARN | 11 | Grantham | 43.00 |
| 4 | 31 | Elena ALDENHOFF-KELLY | 17 | Grantham | 41.55 |
| 5 | 32 | Isabelle CLAYTON | 13 | Grantham | 40.98 |
| 6 | 33 | Cyril BAO | 9 | Grantham | 40.70 |
| 7 | 34 | Emmeline GLEAVE | 10 | Grantham | 40.14 |
| 8 | 35 | Hannah DOBNEY | 16 | Grantham | 39.71 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 36 | Derrin BROCKLEBANK | 11 | Grantham | 39.51 |
| 2 | 37 | Ava-Grace GREGORY | 13 | Grantham | 39.27 |
| 3 | 38 | Henry DOLAN | 12 | Grantham | 38.81 |
| 4 | 39 | Octavia SHEARN | 13 | Grantham | 38.35 |
| 5 | 40 | Ella KHAMA | 11 | Grantham | 38.17 |
| 6 | 41 | Hollie-Ann CROOK | 11 | Grantham | 37.95 |
| 7 | 42 | Elliot GLEAVE | 12 | Grantham | 37.91 |
| 8 | 43 | Freddie HIRST | 11 | Grantham | 37.86 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 44 | Thomas KINNEAR | 14 | Grantham | 37.81 |
| 2 | 45 | Juliette KIM | 10 | Grantham | 37.68 |
| 3 | 46 | Juliette KING | 13 | Grantham | 36.63 |
| 4 | 47 | Lexie SHEWAN | 15 | Grantham | 36.49 |
| 5 | 48 | George LEONARD | 13 | Grantham | 36.42 |
| 6 | 49 | Mia PARAPIJONAVICIUTE | 16 | Grantham | 35.64 |
| 7 | 50 | Leo BARNETT | 13 | Grantham | 35.53 |
| 8 | 51 | Lucy ABBOTT | 13 | Grantham | 35.40 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 52 | Jessica - Rose DAVISON | 16 | Grantham | 35.21 |
| 2 | 53 | Isobel ALLSOP | 15 | Grantham | 34.99 |
| 3 | 54 | Grace HOWITT | 16 | Grantham | 34.96 |
| 4 | 55 | Alfie HAIGH | 16 | Grantham | 34.87 |
| 5 | 56 | Markas PARAPIJONAVICIU | 12 | Grantham | 34.69 |
| 6 | 57 | Jimmin BAO | 12 | Grantham | 34.35 |
| 7 | 58 | Yu Ching (Eugene) CHEU | 14 | Grantham | 34.27 |
| 8 | 59 | Isla GRAY | 15 | Grantham | 33.83 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 60 | Lucy WILLATTS | 14 | Grantham | 33.61 |
| 2 | 61 | Amy TAYLOR | 14 | Grantham | 33.38 |
| 3 | 62 | Thomas HILLSON | 12 | Grantham | 33.00 |
| 4 | 63 | Sophie WARD | 16 | Grantham | 32.63 |
| 5 | 64 | Darcey WOOD | 14 | Grantham | 32.03 |
| 6 | 65 | Ellena HOWITT | 14 | Grantham | 31.42 |
| 7 | 66 | Annabelle JAY | 14 | Grantham | 31.41 |
| 8 | 67 | Chloe HOPKINSON | 20 | Grantham | 31.35 |
| Heat Number - 10 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 69 | Grace MACDONALD | 16 | Grantham | 29.86 |
| 2 | 71 | Jacob FISH | 16 | Grantham | 28.61 |
| 3 | 73 | Jack ZERAVICA | 17 | Grantham | 28.18 |
| 4 | 75 | Benjamin ROBERTS | 16 | Grantham | 27.06 |
| 5 | 74 | Ben CARLYLE | 15 | Grantham | 28.17 |
| 6 | 72 | Zach HOPKINSON | 16 | Grantham | 28.30 |
| 7 | 70 | Luke DAYBELL | 16 | Grantham | 29.09 |
| 8 | 68 | Grace TURNER | 18 | Grantham | 30.34 |