EVENT 306 Female 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Aylah LALANI | 10 | Linslade | |
| 4 | 4 | Alexandra TERNOUTH | 14 | Verulam | |
| 5 | 2 | Amelia BUCKMASTER | 10 | Team Luton | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Alicia SPURWAY | 9 | Linslade | |
| 2 | 8 | Phoebe YOUNG | 10 | Linslade | 2:00.20 |
| 3 | 10 | Matilda SPINK | 11 | St Ives | 1:49.44 |
| 4 | 13 | Parisha CHAUHAN-FRANCE | 11 | Dunstable | 1:46.22 |
| 5 | 12 | Natasha GREEN | 10 | Verulam | 1:46.42 |
| 6 | 9 | Erin SMITH | 10 | Berkhamsted | 1:59.88 |
| 7 | 7 | Elodie BROWN | 9 | Linslade | 2:01.40 |
| 8 | 5 | Grace FAHEY | 9 | Berkhamsted | |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 17 | Aoife SEARS | 12 | Dunstable | 1:42.62 |
| 2 | 19 | Isabelle HOWARD | 12 | West Suffolk | 1:36.55 |
| 3 | 21 | Emma WOOD | 11 | Team Luton | 1:33.76 |
| 4 | 23 | Ines BADDI | 13 | Linslade | 1:33.46 |
| 5 | 22 | Grace Cheuk Kiu YIP | 11 | Verulam | 1:33.59 |
| 6 | 20 | Ella THOMAS | 11 | Linslade | 1:35.74 |
| 7 | 18 | Charlotte BUCKTROUT | 9 | Linslade | 1:40.97 |
| 8 | 15 | Eleanor GROSSEY | 12 | Dunstable | 1:43.93 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 26 | Elizabeth PARTON | 12 | Linslade | 1:30.44 |
| 2 | 28 | Carolina PRUSAK | 12 | Team Luton | 1:29.48 |
| 3 | 32 | Ruth BISCOE | 11 | Team Luton | 1:26.80 |
| 4 | 34 | Fia BURR | 14 | Biggleswade | 1:26.14 |
| 5 | 33 | Alyssia LAKE | 14 | Linslade | 1:26.48 |
| 6 | 30 | Harriet COX | 14 | Linslade | 1:28.23 |
| 7 | 27 | Eliza BARFORD | 12 | Linslade | 1:29.68 |
| 8 | 24 | Evania RAMIREZ DUTTON | 12 | Team Luton | 1:33.06 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 36 | Lucy BISCOE | 10 | Team Luton | 1:23.15 |
| 2 | 38 | Elizabeth STOCKS | 13 | Linslade | 1:22.10 |
| 3 | 42 | Martha MELLORS | 12 | Verulam | 1:20.16 |
| 4 | 44 | Elizabeth SAVORY | 15 | St Ives | 1:18.40 |
| 5 | 43 | Ameline KRECKEL | 13 | Berkhamsted | 1:18.66 |
| 6 | 41 | Lauren IBBOTSON | 12 | Linslade | 1:20.31 |
| 7 | 37 | Thea SLATER | 13 | Team Luton | 1:22.17 |
| 8 | 35 | Lila ROSEBLADE | 12 | Verulam | 1:24.94 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 46 | Layla BURDETT | 14 | St Ives | 1:16.66 |
| 2 | 48 | Emma LAYZELL | 18 | Linslade | 1:15.80 |
| 3 | 50 | Olivia PIASKOWSKA | 13 | Dunstable | 1:13.78 |
| 4 | 52 | Alice BUCKINGHAM | 12 | Team Luton | 1:12.51 |
| 5 | 51 | Charlotte STOCKS | 13 | Linslade | 1:13.52 |
| 6 | 49 | Darcy DEAR | 14 | Dunstable | 1:14.40 |
| 7 | 47 | Rose MCKERN | 14 | Verulam | 1:16.65 |
| 8 | 45 | Chloe BUCKTROUT | 12 | Linslade | 1:17.87 |