EVENT 501 Womens Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 2 | Roisin Ramsay | 01 | Warrender Ba | 4:26.39 |
| 2 | 4 | Jessica Podger | 01 | Co Bristol | 4:26.19 |
| 3 | 6 | Eva Vicary | 00 | Co Coventry | 4:25.50 |
| 4 | 8 | Emily Large | 01 | Newcastle | 4:25.34 |
| 5 | 7 | Jessica Thomson | 99 | Co Aberdeen | 4:25.50 |
| 6 | 5 | Niamh Hofland | 02 | Royal Wolv | 4:25.57 |
| 7 | 3 | Phoebe Griffiths | 00 | Ellesmere Co | 4:26.31 |
| 8 | 1 | Sophie Smith | 01 | St Thomas | 4:26.51 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 10 | Sophie Millen | 99 | Wycombe Dist | 4:24.64 |
| 2 | 12 | Maisie Macartney | 01 | Thanet Swim | 4:23.98 |
| 3 | 14 | Rachel Anderson | 02 | Millfield | 4:22.80 |
| 4 | 16 | Abby Smith | 96 | Birm'ham Uni | 4:21.30 |
| 5 | 15 | Meg Finnon | 98 | Eastkilbride | 4:21.42 |
| 6 | 13 | Alaina Ward | 01 | Havant & Wat | 4:23.90 |
| 7 | 11 | Leah Crisp | 01 | Co Leeds | 4:24.30 |
| 8 | 9 | Esther Halford | 00 | Derventio | 4:24.73 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 18 | Lauren Walton | 95 | Loughboro Un | 4:20.91 |
| 2 | 20 | Megan Bowen | 97 | Mt Kelly | 4:20.68 |
| 3 | 22 | Brearnna Close | 97 | Stockport Mo | 4:20.56 |
| 4 | 24 | Lucinda Campbell | 96 | Loughboro Un | 4:20.27 |
| 5 | 23 | Amber Keegan | 97 | Co Sheffield | 4:20.52 |
| 6 | 21 | Emma Chard | 96 | Tacoma Swim | 4:20.56 |
| 7 | 19 | Lucy Ellis | 97 | Co Sund'land | 4:20.90 |
| 8 | 17 | Grace Lee | 95 | Loughboro Un | 4:21.10 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 26 | Annalea Davison | 01 | Newcastle | 4:19.33 |
| 2 | 28 | Isobel Grant | 98 | Co Sheffield | 4:18.71 |
| 3 | 30 | Kathryn Greenslade | 98 | Preston | 4:18.16 |
| 4 | 32 | Abbie Houston | 95 | Co Sheffield | 4:17.38 |
| 5 | 31 | Georgia Coates | 99 | Co Leeds | 4:18.12 |
| 6 | 29 | Katie Rennolds | 98 | Burnley BOBC | 4:18.59 |
| 7 | 27 | Aisha Thornton | 91 | Loughboro Un | 4:18.79 |
| 8 | 25 | Hannah Featherstone | 99 | Sedgefield | 4:19.93 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 35 | Elizabeth Harris | 00 | Stockport Mo | 4:17.25 |
| 2 | 39 | Ellena Jones | 97 | Swansea Aq | 4:15.29 |
| 3 | 43 | Georgina Boyle | 98 | Chelsea&West | 4:13.55 |
| 4 | 47 | Eleanor Faulkner | 93 | Co Sheffield | 4:10.69 |
| 5 | 45 | Holly Hibbott | 99 | Stockport Mo | 4:11.29 |
| 6 | 41 | Alice Dearing | 97 | Loughboro Un | 4:14.75 |
| 7 | 37 | Abbie Wood | 99 | Loughboro Un | 4:16.11 |
| 8 | 33 | Anne Bochmann | 93 | Bath Univ | 4:17.30 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 36 | Isobel Griffiths | 99 | Co Birm'ham | 4:16.53 |
| 2 | 40 | Georgia Darwent | 98 | Newcastle | 4:15.04 |
| 3 | 44 | Chloe Finch | 98 | Co Birm'ham | 4:11.58 |
| 4 | 48 | Jazmin Carlin | 90 | Bath Univ | 4:03.51 |
| 5 | 46 | Camilla Hattersley | 95 | Co Glasgow | 4:10.90 |
| 6 | 42 | Libby Mitchell | 93 | Swansea Aq | 4:13.99 |
| 7 | 38 | Jessie Westnidge | 97 | Co Sheffield | 4:16.05 |
| 8 | 34 | Lucy McKenzie | 97 | Stockport Mo | 4:17.26 |