EVENT 501 Womens Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 3 | 1 | Megan Sheard | 01 | Stockport Mo | 4:31.26 |
| 4 | 3 | Tori Sopp | 00 | Wirral Metro | 4:26.82 |
| 5 | 2 | Molly Francis | 01 | Mt Kelly | 4:30.23 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 5 | Alice Alcaras | 00 | Aberdeen Per | DN:C . |
| 2 | 7 | Ellenor Rixon | 00 | Guildford Ct | 4:30.67 |
| 3 | 9 | Anna Smail | 02 | Ellesmere Co | 4:25.28 |
| 4 | 11 | Fleur Lewis | 03 | Barnet Copt | 4:28.74 |
| 5 | 10 | Megan Davies | 00 | Barnet Copt | 4:29.66 |
| 6 | 8 | Alisha Hawkins | 01 | Stockport Mo | 4:23.90 |
| 7 | 6 | Jemima Hall | 01 | Hillingdon | DN:C . |
| 8 | 4 | Lola Davison | 03 | Newcastle | 4:35.68 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 13 | Eva Vicary | 00 | Co Coventry | 4:30.93 |
| 2 | 15 | Sophie Negrine | 03 | Ellesmere Co | 4:41.13 |
| 3 | 17 | Georgina Dennis | 02 | Mt Kelly | 4:28.41 |
| 4 | 19 | Esther Halford | 00 | Derventio | 4:32.22 |
| 5 | 18 | Chloe Plater | 00 | Mt Kelly | 4:25.86 |
| 6 | 16 | Iona Macleod | 03 | Dun City Aqu | 4:25.71 |
| 7 | 14 | Alicia Dingle | 02 | Royal Wolv | 4:29.19 |
| 8 | 12 | Chloe Lence | 01 | Modernian | 4:31.24 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 21 | Jessica Podger | 01 | Co Bristol | 4:23.83 |
| 2 | 23 | Caitlin Mackay | 01 | Wycombe Dist | 4:27.96 |
| 3 | 25 | Sophie Smith | 01 | St Thomas | 4:21.47 |
| 4 | 27 | Roisin Ramsay | 01 | Warrender Ba | 4:25.56 |
| 5 | 26 | Sian Martin | 00 | Newcastle | 4:27.56 |
| 6 | 24 | Hannah Sloan | 00 | Co Cardiff | 4:27.78 |
| 7 | 22 | Emilia Sansome | 01 | Wycombe Dist | 4:24.11 |
| 8 | 20 | Michaella Glenister | 02 | Co Leicester | 4:22.74 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 29 | Elizabeth Harris | 00 | Stockport Mo | 4:23.41 |
| 2 | 31 | Lucy Ellis | 97 | Co Sund'land | 4:30.49 |
| 3 | 33 | Emily Siebrecht | 97 | Bath Univ | DN:C . |
| 4 | 35 | Nikki Miller | 00 | Eastkilbride | 4:18.25 |
| 5 | 34 | Isobel Grant | 98 | Co Sheffield | 4:18.32 |
| 6 | 32 | Georgina Boyle | 98 | Bath Univ | DQ: . |
| 7 | 30 | Rachel Anderson | 02 | Millfield | 4:23.28 |
| 8 | 28 | Phoebe Griffiths | 00 | Ellesmere Co | 4:26.01 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 38 | Mollie Wright | 98 | Nova Cent'n | 4:20.57 |
| 2 | 42 | Amber Keegan | 97 | Co Sheffield | 4:29.56 |
| 3 | 46 | Hannah Miley | 89 | Aberdeen Per | 4:13.12 |
| 4 | 50 | Holly Hibbott | 99 | Stockport Mo | 4:12.49 |
| 5 | 48 | Eleanor Faulkner | 93 | Co Sheffield | 4:13.13 |
| 6 | 44 | Abbie Houston | 95 | Co Sheffield | 4:16.90 |
| 7 | 40 | Monique Olivier | 98 | Edinburgh Un | 4:17.01 |
| 8 | 36 | Maya Westlake | 97 | Co Sheffield | 4:22.74 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 39 | Leah Crisp | 01 | Co Leeds | 4:20.60 |
| 2 | 43 | Isobel Griffiths | 99 | Co Birm'ham | 4:18.64 |
| 3 | 47 | Kathryn Greenslade | 98 | Edinburgh Un | 4:15.64 |
| 4 | 51 | Jazmin Carlin | 90 | Bath Univ | 4:12.71 |
| 5 | 49 | Camilla Hattersley | 95 | Co Glasgow | 4:14.90 |
| 6 | 45 | Alice Dearing | 97 | Loughboro Un | 4:17.65 |
| 7 | 41 | Georgia Darwent | 98 | Newcastle | 4:18.67 |
| 8 | 37 | Maisie Macartney | 01 | Thanet Swim | 4:24.03 |