EVENT 304 Womens Open 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Charlotte Robinson | 16 | Co Leeds | 1:12.36 |
| 1 | 3 | Ellen Bagley | 14 | Co Oxford | 1:12.36 |
| 2 | 5 | Charlotte Emery | 16 | TauntonDeane | 1:12.28 |
| 3 | 7 | Kameliya Stoimenova | 16 | Bo Newham | 1:12.25 |
| 4 | 9 | Safiya Sillah | 16 | Co Oxford | 1:12.18 |
| 5 | 8 | Megan Daley | 16 | Wycombe Dist | 1:12.23 |
| 6 | 6 | Hermione Roe | 14 | Stockport Mo | 1:12.25 |
| 7 | 4 | Isabella Renwick | 16 | Millfield | 1:12.33 |
| 8 | 2 | Emily Robson | 16 | York City | 1:12.36 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 11 | Sienna Robinson | 14 | Sheffield C | 1:12.09 |
| 1 | 13 | Ella Bainbridge | 15 | Donc Dartes | 1:11.91 |
| 2 | 15 | Georgia Gussey | 15 | Co Bristol | 1:11.84 |
| 3 | 17 | Paige Fenton | 16 | Skipton | 1:11.70 |
| 4 | 19 | Alice Chan | 16 | Millfield | 1:11.47 |
| 5 | 18 | Carys O'Reilly | 16 | Co Leicester | 1:11.55 |
| 6 | 16 | Daria Poma Kostik | 18 | Wycombe Dist | 1:11.76 |
| 7 | 14 | Ellie Sibbald-Perkins | 15 | Co Birm'ham | 1:11.85 |
| 8 | 12 | Eliza Powell | 15 | Bromley | 1:12.02 |
| 9 | 10 | Sophia Wilson | 18 | Millfield | 1:12.15 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 23 | Abigail Miles | 15 | Co Sheffield | 1:11.29 |
| 1 | 29 | Hollie Steer | 17 | Dartmoor DA | 1:10.95 |
| 2 | 35 | Rosanna Arnold | 19 | Guildford Ct | 1:10.37 |
| 3 | 41 | Lana Broekhoven | 16 | Plymouth Lea | 1:09.72 |
| 4 | 47 | Megan Morrison | 21 | Loughboro Un | 1:06.77 |
| 5 | 44 | Angharad Evans | 16 | West Suffolk | 1:08.79 |
| 6 | 38 | Hazal Ozkan | 16 | Mt Kelly | 1:10.21 |
| 7 | 32 | Anna Morgan | 16 | Millfield | 1:10.72 |
| 8 | 26 | Caitlin Lansom | 14 | Stockport Mo | 1:11.08 |
| 9 | 20 | Sophie Payne | 17 | Hatfield | 1:11.42 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 24 | Grace King | 16 | teamipswich | 1:11.27 |
| 1 | 30 | Natalia Druett | 16 | AbingdonVale | 1:10.80 |
| 2 | 36 | Olivia Herron | 15 | Stockport Mo | 1:10.25 |
| 3 | 42 | Laura Kinley | 23 | Io Man | 1:09.70 |
| 4 | 48 | Jocelyn Ulyett | 24 | Loughboro Un | 1:06.77 |
| 5 | 45 | Lily Booker | 18 | Millfield | 1:07.20 |
| 6 | 39 | Illizane Pinfold | 15 | Co Oxford | 1:10.08 |
| 7 | 33 | Aiyana Lawson | 18 | Co Milton K | 1:10.71 |
| 8 | 27 | Imogen Lambert | 15 | Mt Kelly | 1:11.08 |
| 9 | 21 | Emily Surminski | 17 | Brompton | 1:11.34 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 25 | Kathryn Gill | 32 | Co Cambridge | 1:11.17 |
| 1 | 31 | Pixie Lale-Klasicki | 23 | Brompton | 1:10.78 |
| 2 | 37 | Cira Fletcher | 21 | Nova Cent'n | 1:10.22 |
| 3 | 43 | Charlotte Rigg | 17 | Co Birm'ham | 1:09.21 |
| 4 | 49 | Sarah Vasey | 23 | Loughboro Un | 1:06.24 |
| 5 | 46 | Rebecca Clynes | 17 | Co Leeds | 1:06.97 |
| 6 | 40 | Rebecca Burton | 21 | Loughboro Un | 1:09.76 |
| 7 | 34 | Beth Dennis | 16 | Co Peterboro | 1:10.46 |
| 8 | 28 | Amelia Monaghan | 17 | Co Peterboro | 1:11.05 |
| 9 | 22 | Lucia Grant | 16 | Plymouth Lea | 1:11.32 |