EVENT 203 Boy/Girl 12 /Under 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Joshua MCMILLAN | 10 | Co Leeds | 2:07.13 |
| 2 | 4 | Freya ELLIS | 9 | Co Leeds | 2:00.00 |
| 3 | 6 | Niamh KHAN | 12 | Co Manch Aq | 1:57.73 |
| 4 | 8 | Emily ROWE | 10 | Co Manch Aq | 1:52.10 |
| 5 | 7 | Elizabeth BOND | 9 | Co Leeds | 1:55.31 |
| 6 | 5 | Rory KING | 11 | Co Leeds | 1:58.21 |
| 7 | 3 | Owen TEMPEST | 10 | Co Leeds | 2:05.00 |
| 8 | 1 | Dean NENOV | 12 | Co Leeds | 2:07.29 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 10 | Isabelle HALL | 10 | Co Leeds | 1:50.43 |
| 1 | 12 | Oscar O'DONNELL | 9 | Co Leeds | 1:47.44 |
| 2 | 14 | Ella JORDAN | 11 | Co Leeds | 1:44.77 |
| 3 | 16 | Amit MALTZ | 11 | Co Leeds | 1:41.39 |
| 4 | 18 | Eloise ANDREASEN | 11 | Co Leeds | 1:40.56 |
| 5 | 17 | Penelope DALLIMORE | 10 | Co Leeds | 1:40.70 |
| 6 | 15 | Elkie FOSTER | 10 | Co Leeds | 1:42.88 |
| 7 | 13 | Evie GLOVER | 12 | Co Leeds | 1:45.01 |
| 8 | 11 | James ASHCROFT | 9 | Co Leeds | 1:47.60 |
| 9 | 9 | Isabella JUSTHAM | 11 | Co Leeds | 1:52.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 20 | Matei STOICESCU | 11 | Co Leeds | 1:38.00 |
| 1 | 22 | Ellie AKHTAR | 11 | Co Leeds | 1:35.09 |
| 2 | 24 | Halo BENTLEY-HICKS | 10 | Co Leeds | 1:34.65 |
| 3 | 26 | Ava CONNELL | 12 | Co Leeds | 1:32.60 |
| 4 | 28 | Matilda BRAITHWAITE | 11 | Co Leeds | 1:32.00 |
| 5 | 27 | Jessica WOODS | 11 | Co Leeds | 1:32.23 |
| 6 | 25 | Annabelle HART | 12 | Co Leeds | 1:34.20 |
| 7 | 23 | Robyn HOWARD | 11 | Co Leeds | 1:34.71 |
| 8 | 21 | Holly HARRISON | 11 | Co Leeds | 1:35.96 |
| 9 | 19 | Eve PARKIN | 11 | York City | 1:38.69 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 31 | Scarlett CLARKSON | 11 | Co Leeds | 1:30.89 |
| 1 | 33 | Samuel HILL | 12 | Co Leeds | 1:28.88 |
| 2 | 35 | Evie WOODS | 12 | Co Leeds | 1:28.77 |
| 3 | 37 | Elizabeth WARNER | 10 | Co Leeds | 1:26.46 |
| 4 | 39 | Tylan FLETCHER | 12 | Co Leeds | 1:26.03 |
| 5 | 38 | Jacob O'DONNELL | 11 | Co Leeds | 1:26.35 |
| 6 | 36 | Abigail JAMES | 12 | York City | 1:28.05 |
| 7 | 34 | Isaac FOY | 12 | Co Leeds | 1:28.81 |
| 8 | 32 | Darcey BLACKER | 12 | Co Leeds | 1:30.73 |
| 9 | 30 | Anabella CHAMBERS | 12 | Co Leeds | 1:31.00 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 41 | Emmie HORWELL | 12 | York City | 1:22.02 |
| 1 | 43 | Chloe MALONEY | 12 | Co Leeds | 1:18.24 |
| 2 | 45 | Millie WALKER | 12 | Co Leeds | 1:16.69 |
| 3 | 47 | Matilda POTTER | 12 | Co Leeds | 1:15.40 |
| 4 | 49 | William HICKLIN | 12 | Co Leeds | 1:11.10 |
| 5 | 48 | Liliah VINCENT | 12 | Co Leeds | 1:12.87 |
| 6 | 46 | Alice AITKEN | 12 | York City | 1:16.49 |
| 7 | 44 | Lucas THOMAS | 12 | Conwy | 1:17.50 |
| 8 | 42 | Asher MAXFIELD | 12 | Co Leeds | 1:20.84 |
| 9 | 40 | Olivia MCSEVENY | 12 | York City | 1:24.00 |