EVENT 104 Female 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Alessia DOCHITU | 10 | Team Luton | |
| 4 | 3 | Elizabeth MAGRATH | 10 | Linslade | |
| 5 | 2 | Victoria BANDURAC | 10 | Linslade | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 5 | Beatrice WATSON | 11 | West Suffolk | |
| 3 | 7 | Evelyn NELDER | 11 | West Suffolk | 2:28.47 |
| 4 | 9 | Elodie BROWN | 9 | Linslade | 2:23.28 |
| 5 | 8 | Monika BOSAS | 10 | Team Luton | 2:27.10 |
| 6 | 6 | Chloe RELF | 10 | Team Luton | |
| 7 | 4 | Amelia BUCKMASTER | 10 | Team Luton | |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Thamara EKANAYAKE | 15 | Bletchley | 2:03.60 |
| 2 | 15 | Laia ZURBANO TORRE | 10 | St Ives | 1:59.41 |
| 3 | 17 | Emma WOOD | 11 | Team Luton | 1:52.50 |
| 4 | 19 | Shayaan MAYANJA | 10 | Team Luton | 1:51.36 |
| 5 | 18 | Florence TAYLOR | 13 | St Ives | 1:52.47 |
| 6 | 16 | Grace FAHEY | 9 | Berkhamsted | 1:52.80 |
| 7 | 13 | Anna-Sophia HEYES | 12 | Linslade | 2:01.02 |
| 8 | 10 | Nicole IRIMIA | 9 | Bletchley | 2:09.72 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 22 | Emma BATTERSBY | 11 | Team Luton | 1:50.38 |
| 2 | 24 | Orla GALLEN | 11 | Verulam | 1:49.57 |
| 3 | 26 | Aoife SEARS | 12 | Dunstable | 1:48.32 |
| 4 | 29 | Ines BADDI | 13 | Linslade | 1:43.75 |
| 5 | 27 | Ffion FORDYCE | 10 | Berkhamsted | 1:47.21 |
| 6 | 25 | Eliza BARFORD | 12 | Linslade | 1:48.75 |
| 7 | 23 | Alisha YANKEY | 11 | Linslade | 1:49.73 |
| 8 | 20 | Ellie BROWNE | 13 | Dunstable | 1:51.02 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Edie RAWSON | 14 | Dunstable | 1:41.91 |
| 2 | 33 | Olivia GOTHARD | 13 | Linslade | 1:40.09 |
| 3 | 37 | Isabella GEARY | 14 | Dunstable | 1:37.52 |
| 4 | 41 | Emilia LITTLECHILD | 13 | Berkhamsted | 1:34.36 |
| 5 | 40 | Emily BESENT | 12 | Berkhamsted | 1:34.44 |
| 6 | 36 | Hayley Wai Shuen TSE | 12 | Verulam | 1:39.37 |
| 7 | 32 | Dorothy GOODA | 11 | Team Luton | 1:41.41 |
| 8 | 30 | Isabelle HOWARD | 12 | West Suffolk | 1:43.23 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 44 | Annabelle MARGOT | 13 | St Ives | 1:30.88 |
| 2 | 48 | Libby FOWLER | 17 | Dunstable | 1:23.91 |
| 3 | 50 | Sophie THACKRAH | 15 | Linslade | 1:22.20 |
| 4 | 52 | Tessa QUAYLE | 17 | St Ives | 1:16.20 |
| 5 | 51 | Alice BUCKINGHAM | 12 | Team Luton | 1:20.54 |
| 6 | 49 | Olivia DANIEL | 12 | Verulam | 1:23.25 |
| 7 | 46 | Eilidh WU | 13 | Verulam | 1:28.71 |
| 8 | 42 | Vlada HAVRYLIUK | 15 | Team Luton | 1:33.68 |