EVENT 201 Female 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Willow DEFFLEY | 10 | Co Sheffield | 7:45.00 |
| 4 | 3 | Beca EDWARDS | 10 | Caernarfon | 7:00.70 |
| 5 | 2 | Laia ANDREWS | 9 | Co Sheffield | 7:40.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 5 | Nell HARGREAVES | 9 | Co Leeds | 6:57.86 |
| 3 | 7 | Lotty CARROLL | 10 | Co Leeds | 6:50.00 |
| 4 | 9 | Katie SADLER | 10 | Co Leeds | 6:48.23 |
| 5 | 8 | Francesca SPALDING | 10 | Co Leeds | 6:50.00 |
| 6 | 6 | Isabella HUTCHISON | 9 | Co Leeds | 6:55.00 |
| 7 | 4 | Erika MARINOVA | 10 | Co Sheffield | 7:00.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Rachel RICHARDSON | 11 | Co Sheffield | 6:30.00 |
| 2 | 13 | Polly JESSOP | 11 | Co Sheffield | 6:30.00 |
| 3 | 15 | Cara-Non ROBERTS | 12 | Nofio P.B.P | 6:30.00 |
| 4 | 17 | Ava MCLARKEY | 10 | Co Leeds | 6:20.00 |
| 5 | 16 | Enya-Rae AINSLIE | 9 | Co Sheffield | 6:25.00 |
| 6 | 14 | Jessica GRAY-THOMAS | 10 | Conwy | 6:30.00 |
| 7 | 12 | Qian SHEN | 10 | Co Leeds | 6:30.00 |
| 8 | 10 | Eve HEPBURN-WOOD | 11 | Co Leeds | 6:47.26 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | Alana RANKIN | 10 | Co Leeds | 6:12.00 |
| 2 | 21 | Jessica COLLEY | 11 | Co Leeds | 6:00.51 |
| 3 | 23 | Lucy SCOTT | 11 | Conwy | 6:00.00 |
| 4 | 25 | Ezmae ALLEN | 11 | Co Sheffield | 5:56.36 |
| 5 | 24 | Phoebe MARSDEN | 12 | Conwy | 5:57.20 |
| 6 | 22 | Evie THORPE | 12 | Co Leeds | 6:00.11 |
| 7 | 20 | Madison SIMMONDS | 12 | Co Sheffield | 6:03.14 |
| 8 | 18 | Madeleine FLAHERTY | 10 | Co Leeds | 6:19.40 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 27 | Kiera WILLIAMS | 13 | Conwy | 5:55.60 |
| 2 | 29 | Rosie HAIGH | 12 | Co Sheffield | 5:53.08 |
| 3 | 31 | Isabelle PARK | 10 | Co Leeds | 5:49.37 |
| 4 | 33 | Cari WILLIAMS | 14 | Caernarfon | 5:43.10 |
| 5 | 32 | Emily SUTTON | 12 | Caernarfon | 5:43.50 |
| 6 | 30 | Isla CUNDILL | 10 | Co Leeds | 5:52.20 |
| 7 | 28 | Evie COOK | 11 | Co Leeds | 5:55.10 |
| 8 | 26 | Evelyn ATKINSON | 10 | Co Leeds | 5:56.25 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 35 | Neve STAFFORD | 11 | Co Leeds | 5:40.50 |
| 2 | 37 | Grace O'HARA | 11 | Co Leeds | 5:34.58 |
| 3 | 39 | Daisy SAYLE | 13 | Conwy | 5:31.50 |
| 4 | 41 | Erin BENTLEY | 13 | Co Leeds | 5:22.76 |
| 5 | 40 | Penelope DALLIMORE | 13 | Co Leeds | 5:29.08 |
| 6 | 38 | Imogen MARSHALL | 11 | Co Sheffield | 5:34.32 |
| 7 | 36 | Amelia SYNOWIEC | 13 | Conwy | 5:35.10 |
| 8 | 34 | Lucy Margaret GRANT | 13 | Nofio P.B.P | 5:40.90 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 43 | Amelia MATSON | 12 | Co Leeds | 5:22.66 |
| 2 | 45 | Addison CROPPER | 11 | Co Leeds | 5:20.62 |
| 3 | 47 | Elizabeth BOND | 12 | Co Leeds | 5:17.06 |
| 4 | 49 | Jessica ROLLINGS | 12 | Co Leeds | 5:09.37 |
| 5 | 48 | Isla STOCKLEY | 12 | Co Sheffield | 5:12.46 |
| 6 | 46 | Eva SYLVESTER | 12 | Co Leeds | 5:20.55 |
| 7 | 44 | Juliette CONNOLLY | 13 | Conwy | 5:22.50 |
| 8 | 42 | Livia STACEY | 12 | Co Leeds | 5:22.69 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 51 | Ella JORDAN | 13 | Co Leeds | 5:06.61 |
| 2 | 53 | Emily MARRISON | 14 | Co Leeds | 5:00.50 |
| 3 | 55 | Serenity THOMAS | 13 | Conwy | 4:58.58 |
| 4 | 57 | Ciara CUST | 16 | Conwy | 4:50.60 |
| 5 | 56 | Erin DEVIN | 13 | Connahs Quay | 4:56.10 |
| 6 | 54 | Mali ROBERTS | 13 | Nofio P.B.P | 4:58.96 |
| 7 | 52 | Amit MALTZ | 13 | Harrogate | 5:06.27 |
| 8 | 50 | Esyllt ACH RHYS | 13 | Caernarfon | 5:08.80 |