EVENT 702 Female 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 3 | 1 | Zara HALPIN | 11 | Swindon Dolp | 5:31.97 |
| 4 | 3 | Orla GIBBON | 11 | Co Sheffield | 5:23.30 |
| 5 | 2 | Amelie HAUSCHILD | 11 | Co Sheffield | 5:28.20 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 2 | 5 | Abigail HODGES | 10 | Chesterfield | 5:13.01 |
| 3 | 7 | Daisy TATLOW-TURNER | 10 | Chesterfield | 5:01.46 |
| 4 | 9 | Abigail BEIGHTON | 10 | Co Sheffield | 4:57.40 |
| 5 | 8 | India BROWN | 10 | Soundwell | 4:58.00 |
| 6 | 6 | Lily-Grace BELFIELD | 10 | Chesterfield | 5:07.27 |
| 7 | 4 | Jasmine UMNEY | 11 | Chesterfield | 5:22.20 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 11 | Kyra WINTER | 11 | Chesterfield | 4:52.16 |
| 2 | 13 | Francesca PALFREY | 06 | Loughborough | 4:45.01 |
| 3 | 15 | Rylie ACKROYD | 08 | Tadcaster | 4:43.45 |
| 4 | 17 | Isabel BRAND | 09 | Rugby | 4:40.71 |
| 5 | 16 | Ruby ROBINSON | 09 | Tadcaster | 4:41.60 |
| 6 | 14 | Zara HOLT | 10 | Tadcaster | 4:44.00 |
| 7 | 12 | Georgie RENNALS | 06 | Repton | 4:47.28 |
| 8 | 10 | Izzy WILLIAMS | 10 | Co Sheffield | 4:55.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 19 | Laurie DEVINE | 06 | Repton | 4:39.34 |
| 2 | 21 | Rosie WHITTEN | 07 | Swim Belfast | 4:32.60 |
| 3 | 23 | Lucy CADDEN | 04 | Co Sheffield | 4:30.50 |
| 4 | 25 | Mia MASON | 06 | Co Manch Aq | 4:29.39 |
| 5 | 24 | Ekaterina PRICE | 01 | Bath Univ | 4:30.10 |
| 6 | 22 | Jessica KEOGH | 04 | Hatfield | 4:30.75 |
| 7 | 20 | Darcey MURPHY | 07 | Stockport Mo | 4:38.35 |
| 8 | 18 | Cazia MARTIN | 09 | Co Sheffield | 4:40.00 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 29 | Eleanor BROUGHTON | 06 | Repton | 4:27.04 |
| 2 | 35 | Isla JONES | 07 | Co Sheffield | 4:21.90 |
| 3 | 41 | Scarlett ORCHARD | 03 | Loughboro Un | 4:18.50 |
| 4 | 47 | Victoria CATTERSON | 01 | NC Dublin | 4:10.45 |
| 5 | 44 | Henrietta D'AMMASSA | 05 | Co Manch Aq | 4:15.40 |
| 6 | 38 | Chloe GOODRIDGE | 05 | Bath Univ | 4:20.40 |
| 7 | 32 | Louise ASHFORD | 05 | Bath Univ | 4:23.70 |
| 8 | 26 | Leila FLOWER | 04 | Bath Univ | 4:29.20 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 30 | Madison EMMENT | 07 | Repton | 4:25.00 |
| 2 | 36 | Georgia ROBERTSON | 05 | Co Sheffield | 4:21.90 |
| 3 | 42 | Natasha SIMSON | 05 | Bath Univ | 4:18.50 |
| 4 | 48 | Shannon STOTT | 00 | Hatfield | 4:08.30 |
| 5 | 45 | Ava COOK | 08 | Co Sheffield | 4:14.94 |
| 6 | 39 | Isabelle JOPSON | 03 | Loughboro Un | 4:20.00 |
| 7 | 33 | Mollie FISHER | 05 | Co Manch Aq | 4:22.59 |
| 8 | 27 | Willow HARRISON | 09 | Co Sheffield | 4:28.80 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 31 | Eve DOHERTY | 08 | Co Sheffield | 4:24.84 |
| 2 | 37 | Harriet OXLEY | 05 | Repton | 4:21.05 |
| 3 | 43 | Molly BAKER | 07 | Co Sheffield | 4:16.30 |
| 4 | 49 | Mia SLEVIN | 03 | Loughboro Un | 4:07.80 |
| 5 | 46 | Ashleigh BAILLIE | 06 | Co Manch Aq | 4:13.40 |
| 6 | 40 | Jessica SMELT | 07 | Repton | 4:19.50 |
| 7 | 34 | Hannah HODGKISS | 06 | Repton | 4:22.40 |
| 8 | 28 | Chloe COOKE | 07 | Co Sheffield | 4:28.50 |