EVENT 604 Female 15 /Over 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Scarlett Sampson | 15 | Eckington | 1:28.80 |
| 4 | 3 | Lexi Carter | 15 | Ripley | 1:27.91 |
| 5 | 2 | Isabella Margiotta | 15 | Ashbourne | 1:28.50 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | Ellie Randall | 15 | Chesterfield | 1:27.83 |
| 2 | 6 | Matilda Hase | 16 | Long Eaton | 1:27.57 |
| 3 | 8 | Millie Cadden | 16 | Long Eaton | 1:26.06 |
| 4 | 10 | Sophie Martin | 16 | Chesterfield | 1:23.68 |
| 5 | 9 | Eva Lemmon | 15 | DerbyPhoenix | 1:24.40 |
| 6 | 7 | Mia Wilson | 15 | Long Eaton | 1:27.32 |
| 7 | 5 | Sophia Lichfield | 15 | Chesterfield | 1:27.58 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | Helen Sharratt | 17 | DerbyPhoenix | 1:21.95 |
| 2 | 14 | Isla Perry-Taylor | 16 | BelperMarlin | 1:21.20 |
| 3 | 16 | Phoebe Worgan | 15 | BelperMarlin | 1:18.00 |
| 4 | 18 | Mabel Walker | 16 | Repton | 1:13.81 |
| 5 | 17 | Connie Rennard | 15 | Repton | 1:15.10 |
| 6 | 15 | Alice Green | 15 | Swadlincote | 1:18.95 |
| 7 | 13 | Isabelle Kimber | 16 | Ripley | 1:21.62 |
| 8 | 11 | Zoe Boucherat | 16 | Etwall | 1:23.62 |