EVENT 504 Girl Open 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Nancy DUMPHY-WRAITH | 9 | Matlock | 2:03.68 |
| 3 | 4 | Charlotte DENON | 12 | Eckington | 2:00.00 |
| 4 | 3 | Olivia KING | 10 | Deepings | 2:02.95 |
| 5 | 1 | Isla RICHARDS | 10 | Bassetlaw SS | 2:12.41 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Emilie KITCHEN | 11 | Matlock | 1:50.00 |
| 2 | 8 | Jessica STEWART | 15 | Gainsborough | 1:49.59 |
| 3 | 10 | Amelie VENABLES | 11 | Bassetlaw SS | 1:48.70 |
| 4 | 9 | Elspeth DUMPHY-WRAITH | 11 | Matlock | 1:48.74 |
| 5 | 7 | Isla STOCKLEY | 10 | Bassetlaw SS | 1:49.66 |
| 6 | 5 | Holly MONAGHAN | 13 | Bircotes SC | 1:50.38 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | Ava May BROCKLEHURST | 11 | Bassetlaw SS | 1:46.25 |
| 2 | 14 | Poppy GOODACRE | 12 | Bassetlaw SS | 1:42.97 |
| 3 | 16 | Iris HUTCHINSON | 14 | Gainsborough | 1:41.15 |
| 4 | 15 | Mieke MCDONALD | 12 | Deepings | 1:41.91 |
| 5 | 13 | Erin ARCHER | 11 | Co Lincoln P | 1:43.05 |
| 6 | 11 | Mia RICHARDS | 13 | Bassetlaw SS | 1:47.30 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Aimee ALY-WESTON | 12 | Bassetlaw SS | 1:38.93 |
| 2 | 20 | Imogen HOWITT | 10 | Bassetlaw SS | 1:37.15 |
| 3 | 22 | Hannah CROKER | 15 | Bircotes SC | 1:36.56 |
| 4 | 21 | Christabella TURNER | 14 | Eckington | 1:36.95 |
| 5 | 19 | Stansie CROWE | 11 | Bassetlaw SS | 1:37.73 |
| 6 | 17 | Emmy STINTON | 12 | Co Lincoln P | 1:39.42 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 24 | Nyah ALLERT | 16 | Eckington | 1:35.30 |
| 2 | 26 | Lauren MCMANUS | 14 | Eckington | 1:32.18 |
| 3 | 28 | Hannah SAMUEL | 14 | Bircotes SC | 1:31.52 |
| 4 | 27 | Penelope BAXTER | 16 | Deepings | 1:31.80 |
| 5 | 25 | Isabelle MCCORKELL | 14 | Gainsborough | 1:32.41 |
| 6 | 23 | Scarlett SAMPSON | 13 | Eckington | 1:36.32 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 30 | Iona WATSON | 13 | Bassetlaw SS | 1:27.59 |
| 2 | 32 | Olivia MARSHALL | 14 | Derventio | 1:23.99 |
| 3 | 34 | Madeleine SMIRTHWAITE | 14 | Co Lincoln P | 1:17.72 |
| 4 | 33 | Tiegan GRAY | 15 | Gainsborough | 1:21.54 |
| 5 | 31 | Millie CADDEN | 15 | Co Derby | 1:26.06 |
| 6 | 29 | Isla O'CONNOR | 12 | Bassetlaw SS | 1:29.08 |