EVENT 202 Womens Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 3 | 1 | Laura Brookes | 01 | Donc Dartes | 4:39.05 |
| 4 | 3 | Eleanor Jones | 01 | Co Leeds | 4:38.51 |
| 5 | 2 | Alisha Hawkins | 01 | Winsford | 4:38.84 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 2 | 5 | Alexandra Waller | 01 | Heart Of Mid | 4:38.03 |
| 3 | 7 | Maddison Saunders | 01 | Co Peterboro | 4:37.67 |
| 4 | 9 | Emily Large | 01 | Newcastle | 4:37.15 |
| 5 | 8 | Ellie Molyneux | 01 | Wigan BEST | 4:37.32 |
| 6 | 6 | Tiegan Child | 02 | Beckenham | 4:37.69 |
| 7 | 4 | Laura McNab | 01 | Aquae Sulis | 4:38.42 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 11 | Kiera Henley | 01 | Stockport Mo | 4:36.92 |
| 2 | 13 | Anne Tavierne | 01 | Camden Swiss | 4:36.24 |
| 3 | 15 | Jessica Podger | 01 | Co Bristol | 4:35.39 |
| 4 | 17 | Alaina Ward | 01 | Havant & Wat | 4:33.54 |
| 5 | 16 | Jemima Hall | 01 | Hillingdon | 4:34.95 |
| 6 | 14 | Summer Kennedy | 01 | Nova Cent'n | 4:35.77 |
| 7 | 12 | Madeleine Hoare | 02 | Co Coventry | 4:36.42 |
| 8 | 10 | Sophie Smith | 01 | St Thomas | 4:36.99 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 19 | Ciara Schlosshan | 01 | Co Leeds | 4:30.73 |
| 2 | 21 | Annalea Davison | 01 | Newcastle | 4:29.44 |
| 3 | 23 | Katherine Brown | 99 | Co Peterboro | 4:27.20 |
| 4 | 25 | Kate Clifton | 00 | Co Sheffield | 4:26.96 |
| 5 | 24 | Darcy Deakin | 99 | Co Sheffield | 4:27.18 |
| 6 | 22 | Maisie Macartney | 01 | Thanet Swim | 4:29.35 |
| 7 | 20 | Leah Crisp | 01 | Co Leeds | 4:29.57 |
| 8 | 18 | Niamh Hofland | 02 | Royal Wolv | 4:31.91 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 27 | Loulou Vos | 99 | Hillingdon | 4:26.61 |
| 2 | 29 | Rebecca Thornton | 00 | Bo Kirklees | 4:26.05 |
| 3 | 31 | Hannah Featherstone | 99 | Sedgefield | 4:25.25 |
| 4 | 33 | Caitlin Fearon | 00 | Sevenoaks | 4:24.94 |
| 5 | 32 | Tazmin Pugh | 00 | Ellesmere Co | 4:25.04 |
| 6 | 30 | Tori Sopp | 00 | Wirral Metro | 4:25.27 |
| 7 | 28 | Elizabeth Harris | 00 | Stockport Mo | 4:26.10 |
| 8 | 26 | Phoebe Griffiths | 00 | Bo Waltham F | 4:26.87 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 35 | Meghan Byrne | 00 | Barnet Copt | 4:23.58 |
| 2 | 37 | Sarah Branch | 00 | Northampton | 4:22.35 |
| 3 | 39 | Isobel Griffiths | 99 | Co Birm'ham | 4:19.20 |
| 4 | 41 | Lauren Walton | 95 | Loughboro Un | 4:18.86 |
| 5 | 40 | Isobel Grant | 98 | Co Sheffield | 4:19.02 |
| 6 | 38 | Madeleine Crompton | 00 | Stockport Mo | 4:19.53 |
| 7 | 36 | Sophie Evans | 99 | Swansea Aq | 4:23.02 |
| 8 | 34 | Rebecca Sutton | 01 | Bridgend Cty | 4:24.16 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 44 | Jessie Westnidge | 97 | Co Sheffield | 4:17.13 |
| 2 | 48 | Chloe Finch | 98 | Co Birm'ham | 4:15.71 |
| 3 | 52 | Holly Hibbott | 99 | Stockport Mo | 4:13.86 |
| 4 | 56 | Hannah Miley | 89 | Garioch | 4:06.21 |
| 5 | 54 | Aimee Willmott | 93 | London Aquat | 4:08.98 |
| 6 | 50 | Libby Mitchell | 93 | Swansea Uni | 4:14.73 |
| 7 | 46 | Georgia Darwent | 98 | Newcastle | 4:17.07 |
| 8 | 42 | Abbie Houston | 95 | Co Sheffield | 4:18.65 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 45 | Shauna Lee | 95 | Plymouth Lea | 4:17.10 |
| 2 | 49 | Aisha Thornton | 91 | Loughboro Un | 4:15.50 |
| 3 | 53 | Jessica Thielmann | 93 | Derwentside | 4:09.50 |
| 4 | 57 | Jazmin Carlin | 90 | Bath Univ | 4:03.24 |
| 5 | 55 | Eleanor Faulkner | 93 | Co Sheffield | 4:08.92 |
| 6 | 51 | Camilla Hattersley | 95 | Co Glasgow | 4:14.06 |
| 7 | 47 | Alice Dearing | 97 | Royal Wolv | 4:16.42 |
| 8 | 43 | Kathryn Greenslade | 98 | Preston | 4:18.20 |