EVENT 402 Mixed 50m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | George SPENCER | 8 | Grantham | |
| 2 | 2 | Maja BALL | 9 | Grantham | |
| 3 | 3 | Joyce KIM | 8 | Grantham | |
| 4 | 4 | Tabitha GODDARD | 8 | Grantham | |
| 5 | 5 | Martha WOOD | 9 | Grantham | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Henry LEONARD | 9 | Grantham | |
| 2 | 7 | Oliver PYGOTT-HAMMOND | 9 | Grantham | |
| 3 | 8 | Daryl BOWEN-HALL | 11 | Grantham | |
| 4 | 9 | Lois MCDONNELL | 9 | Grantham | |
| 5 | 10 | Willem POWELL-VREESWIJ | 10 | Grantham | 1:10.00 |
| 6 | 11 | Hannah EXLEY | 11 | Grantham | 1:08.65 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | Matilda HARPER | 9 | Grantham | 59.39 |
| 2 | 13 | Norahh MOE-AUNG | 11 | Grantham | 57.48 |
| 3 | 14 | George DOLAN | 9 | Grantham | 56.69 |
| 4 | 15 | Bethany MEAKIN | 11 | Grantham | 55.53 |
| 5 | 16 | Gracie PAYNE | 12 | Grantham | 55.00 |
| 6 | 17 | Sophia WRIGHT | 9 | Grantham | 53.75 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Ralph MILNE | 10 | Grantham | 53.59 |
| 2 | 19 | Georgia BELLETT | 10 | Grantham | 52.84 |
| 3 | 20 | Evangeline KINNEAR | 12 | Grantham | 52.28 |
| 4 | 21 | Tilly WASKETT-BOOTH | 9 | Grantham | 52.04 |
| 5 | 22 | Evelyn NICHOLLS | 12 | Grantham | 51.72 |
| 6 | 23 | Emily CLAYTON | 11 | Grantham | 51.32 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 24 | Poppy BRODIE | 13 | Grantham | 50.55 |
| 2 | 25 | Annabel HILLSON | 10 | Grantham | 48.87 |
| 3 | 26 | Daniel GODDARD | 10 | Grantham | 47.32 |
| 4 | 27 | Abigail TAYLOR | 11 | Grantham | 46.85 |
| 5 | 28 | Esmé EVANS | 11 | Grantham | 46.62 |
| 6 | 29 | Benjamin SHEARN | 11 | Grantham | 46.42 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 30 | Matilda MCDONNELL | 12 | Grantham | 46.36 |
| 2 | 31 | Emmeline GLEAVE | 10 | Grantham | 45.41 |
| 3 | 32 | Olivia CHARITY | 13 | Grantham | 45.06 |
| 4 | 33 | Francesca WESTON | 10 | Grantham | 45.04 |
| 5 | 34 | Cyril BAO | 9 | Grantham | 44.42 |
| 6 | 35 | Henry DOLAN | 12 | Grantham | 44.29 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 36 | Elizabeth JONES | 15 | Grantham | 43.61 |
| 2 | 37 | Ava-Grace GREGORY | 13 | Grantham | 43.39 |
| 3 | 38 | Juliette KIM | 10 | Grantham | 43.35 |
| 4 | 39 | Caitlin IZOD | 12 | Grantham | 43.08 |
| 5 | 40 | Benjamin GODDARD | 12 | Grantham | 42.90 |
| 6 | 41 | Florence HARPER | 12 | Grantham | 42.53 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 42 | William PENNOCK | 11 | Grantham | 42.36 |
| 2 | 43 | Louis WRIGHT | 12 | Grantham | 42.25 |
| 3 | 44 | Madeline SURTEES | 13 | Grantham | 41.42 |
| 4 | 45 | Isabelle CLAYTON | 13 | Grantham | 41.41 |
| 5 | 46 | Elisabeth KINNEAR | 15 | Grantham | 40.54 |
| 6 | 47 | Octavia SHEARN | 13 | Grantham | 40.31 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 48 | Freddie HIRST | 11 | Grantham | 39.98 |
| 2 | 49 | Ella KHAMA | 11 | Grantham | 39.97 |
| 3 | 50 | Mia PARAPIJONAVICIUTE | 16 | Grantham | 39.67 |
| 4 | 51 | Joshua KIM | 13 | Grantham | 39.35 |
| 5 | 52 | Leo BARNETT | 13 | Grantham | 39.27 |
| 6 | 53 | George LEONARD | 13 | Grantham | 39.23 |
| Heat Number - 10 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 54 | Derrin BROCKLEBANK | 11 | Grantham | 39.19 |
| 2 | 55 | Toby EDMONDSON | 11 | Grantham | 37.89 |
| 3 | 56 | Thomas HILLSON | 12 | Grantham | 37.84 |
| 4 | 57 | Grace HOWITT | 16 | Grantham | 37.39 |
| 5 | 58 | Arthur BREARLEY-NEWSOM | 14 | Grantham | 37.38 |
| 6 | 59 | Elliot GLEAVE | 12 | Grantham | 37.02 |
| Heat Number - 11 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 60 | Elena ALDENHOFF-KELLY | 17 | Grantham | 36.96 |
| 2 | 61 | Lexie SHEWAN | 15 | Grantham | 36.22 |
| 3 | 62 | Markas PARAPIJONAVICIU | 12 | Grantham | 35.66 |
| 4 | 63 | Ellena HOWITT | 14 | Grantham | 35.34 |
| 5 | 64 | Isla GRAY | 15 | Grantham | 35.28 |
| 6 | 65 | Lucy ABBOTT | 13 | Grantham | 34.57 |
| Heat Number - 12 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 66 | Jessica - Rose DAVISON | 16 | Grantham | 34.36 |
| 2 | 67 | Amy TAYLOR | 14 | Grantham | 34.17 |
| 3 | 68 | Darcey WOOD | 14 | Grantham | 34.15 |
| 4 | 69 | Chloe HOPKINSON | 20 | Grantham | 33.17 |
| 5 | 70 | Isobel ALLSOP | 15 | Grantham | 32.46 |
| 6 | 71 | Lucy WILLATTS | 14 | Grantham | 32.17 |
| Heat Number - 13 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 73 | Luke DAYBELL | 16 | Grantham | 30.73 |
| 2 | 75 | Benjamin ROBERTS | 16 | Grantham | 29.82 |
| 3 | 77 | Ben CARLYLE | 15 | Grantham | 28.51 |
| 4 | 76 | Jack ZERAVICA | 17 | Grantham | 29.30 |
| 5 | 74 | Annabelle JAY | 14 | Grantham | 30.28 |
| 6 | 72 | Zach HOPKINSON | 16 | Grantham | 31.68 |