EVENT 314 Female 15 /Over 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 3 | Ella Ratliff | 15 | Derby Excel | 1:38.01 |
| 2 | 9 | Hannah Smith | 17 | Long Eaton | 1:29.01 |
| 3 | 15 | Isabelle Kimber | 17 | Ripley | 1:25.07 |
| 4 | 21 | Amelia Denham | 15 | Chesterfield | 1:15.78 |
| 5 | 18 | Olivia Pope | 15 | Derby Excel | DN:C . |
| 6 | 12 | Ruby Green | 15 | Chesterfield | 1:27.83 |
| 7 | 6 | Isabella Margiotta | 16 | Ashbourne | 1:29.13 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | Daisy Anton | 15 | Ripley | 1:34.66 |
| 2 | 10 | Lexi Carter | 16 | Ripley | 1:28.34 |
| 3 | 16 | Isla Perry-Taylor | 17 | BelperMarlin | 1:25.74 |
| 4 | 22 | Pixie Lale-Klasicki | 28 | Derby Excel | 1:13.58 |
| 5 | 19 | Alice Green | 16 | Swadlincote | DN:C . |
| 6 | 13 | Eva Lemmon | 16 | DerbyPhoenix | 1:25.73 |
| 7 | 7 | Ellie Randall | 16 | Chesterfield | 1:33.40 |
| 8 | 1 | Emily Akitt | 15 | Eckington | 1:32.42 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Amelia Young | 18 | Buxton | DN:C . |
| 2 | 11 | Millie Cadden | 17 | Long Eaton | 1:31.25 |
| 3 | 17 | Olivia Marshall | 17 | BelperMarlin | 1:25.46 |
| 4 | 23 | Imogen Clark | 25 | Derby Excel | 1:07.97 |
| 5 | 20 | Phoebe Worgan | 16 | BelperMarlin | 1:20.31 |
| 6 | 14 | Elena Quinn | 15 | Ripley | 1:25.33 |
| 7 | 8 | Sophia Lichfield | 16 | Chesterfield | 1:30.34 |
| 8 | 2 | Evie Hendry | 15 | Bakewell SC | 1:33.21 |