EVENT 511 Female 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 3 | 1 | Esme KERLEY | 08 | Swindon Dolp | 10:38.10 |
| 4 | 3 | Phoebe KERLEY | 11 | Swindon Dolp | 10:13.20 |
| 5 | 2 | Autum CLAXTON | 11 | Stockport Mo | 10:05.57 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 5 | Abigail BEIGHTON | 10 | Co Sheffield | 10:17.89 |
| 2 | 7 | Darcey MURPHY | 07 | Stockport Mo | 9:48.17 |
| 3 | 10 | Sophie MARTIN | 07 | Chesterfield | 9:27.44 |
| 4 | 12 | Francesca PALFREY | 06 | Loughborough | 10:15.27 |
| 5 | 11 | Cazia MARTIN | 09 | Co Sheffield | 9:36.79 |
| 6 | 8 | Elizabeth PALFREY | 08 | Loughborough | 9:58.56 |
| 7 | 6 | Izzy WILLIAMS | 10 | Co Sheffield | 10:12.23 |
| 8 | 4 | Daisy TATLOW-TURNER | 10 | Chesterfield | 10:04.67 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 14 | Lucy CADDEN | 04 | Co Sheffield | 9:17.79 |
| 2 | 16 | Leila FLOWER | 04 | Bath Univ | 9:08.00 |
| 3 | 18 | Hannah HODGKISS | 06 | Repton | 9:22.05 |
| 4 | 20 | Jessica SMELT | 07 | Repton | 9:00.83 |
| 5 | 19 | Madison EMMENT | 07 | Repton | 9:13.78 |
| 6 | 17 | Isla JONES | 07 | Co Sheffield | 9:10.31 |
| 7 | 15 | Chloe COOKE | 07 | Co Sheffield | 9:11.74 |
| 8 | 13 | Willow HARRISON | 09 | Co Sheffield | 9:22.86 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 22 | Molly BAKER | 07 | Co Sheffield | : . |
| 2 | 24 | Phoebe COOPER | 08 | Co Sheffield | : . |
| 3 | 28 | Ava COOK | 08 | Co Sheffield | : . |
| 4 | 30 | Alice DEARING | 97 | Loughboro Un | : . |
| 5 | 29 | Lucie HANQUET | 03 | Loughboro Un | : . |
| 6 | 26 | Harriet OXLEY | 05 | Repton | : . |
| 7 | 23 | Chloe GOODRIDGE | 05 | Bath Univ | : . |
| 8 | 21 | Georgia ROBERTSON | 05 | Co Sheffield | : . |