EVENT 421 Girls Open 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 3 | 1 | Rea MAXWELL | 11 | Co Leicester | 2:03.71 |
| 4 | 3 | Martha BENNETT | 11 | Shrewsbury | 1:47.03 |
| 5 | 2 | Katie KIRK | 12 | Leicester Ne | 2:01.01 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 5 | Evie WILSON | 11 | Mansfield | 1:43.26 |
| 2 | 7 | Keeva STOPFORTH | 11 | Co Leicester | 1:41.66 |
| 3 | 9 | Ciara DENTON | 14 | Shrewsbury | 1:36.47 |
| 4 | 11 | Lucy SEYMOUR | 10 | Cheadle | 1:34.20 |
| 5 | 10 | Annabel RUSSELL | 10 | Co Leicester | 1:36.42 |
| 6 | 8 | Olivia SMITH | 13 | Nova Cent'n | 1:39.25 |
| 7 | 6 | Laura LUTHI | 11 | Co Leicester | 1:42.76 |
| 8 | 4 | Aurinija MALIAUSKAITE | 12 | South Lincs | 1:46.09 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 13 | Mine AVUL | 14 | Leicester Ne | 1:32.02 |
| 2 | 15 | Hannah MATTHEWS | 14 | Deepings | 1:29.70 |
| 3 | 17 | Felicity WARD | 12 | Braunstone | 1:28.43 |
| 4 | 19 | Jessie SPOONER | 14 | Deepings | 1:25.48 |
| 5 | 18 | Dusty SAINES | 12 | South Lincs | 1:26.30 |
| 6 | 16 | Beau CANN-LIVINGSTONE | 12 | Nova Cent'n | 1:28.78 |
| 7 | 14 | Kate MORRIS | 11 | Nova Cent'n | 1:31.70 |
| 8 | 12 | Mollie BRIGGS | 11 | South Lincs | 1:32.78 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 21 | Jemma HOUSEGO | 11 | Deepings | 1:24.33 |
| 2 | 23 | Katie SHELTON | 14 | Co Leicester | 1:21.05 |
| 3 | 25 | Emily HANNAFORD | 13 | Radford | 1:19.50 |
| 4 | 27 | Mia ALEXANDER | 14 | Braunstone | 1:17.94 |
| 5 | 26 | Alexandra COOPER | 14 | Deepings | 1:19.12 |
| 6 | 24 | Katie DURRINGTON | 14 | Braunstone | 1:19.53 |
| 7 | 22 | Francesca GELMETTI | 16 | Shrewsbury | 1:21.70 |
| 8 | 20 | Ellisha COOKSON | 12 | South Lincs | 1:24.77 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 29 | Hannah LINES | 12 | Co Leicester | 1:17.11 |
| 2 | 31 | Abbie RUDDLE | 13 | Co Leicester | 1:16.40 |
| 3 | 33 | Imogen LINDSEY | 13 | Melton M'bry | 1:15.72 |
| 4 | 35 | Amy GODWIN | 15 | Coalville | 1:14.71 |
| 5 | 34 | Nicola PEACH | 14 | Sutton | 1:14.92 |
| 6 | 32 | Lauren SHAKELL | 13 | Nuneaton | 1:16.30 |
| 7 | 30 | Fleur BEILBY | 13 | Mansfield | 1:16.86 |
| 8 | 28 | Abigail KIRKUP | 13 | Co Leicester | 1:17.83 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 37 | Charlotte GUDGEON | 15 | Leic Sharks | 1:13.96 |
| 2 | 39 | Grace SHORROCK | 16 | Shrewsbury | 1:13.15 |
| 3 | 41 | Mia STRANGE | 17 | Braunstone | 1:10.16 |
| 4 | 43 | Bethany WILDE | 17 | Deepings | 1:08.67 |
| 5 | 42 | Molly HEY | 17 | Melton M'bry | 1:09.68 |
| 6 | 40 | Lauren GRICE | 14 | Coalville | 1:11.34 |
| 7 | 38 | Kelsey GILES | 15 | Nova Cent'n | 1:13.90 |
| 8 | 36 | Rebecca MCKENZIE | 17 | South Lincs | 1:14.57 |