EVENT 701 Womens Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 3 | 1 | Francesca Muir-Harris | 99 | Derventio | 4:44.54 |
| 4 | 3 | Lauren Pirouet | 99 | Fife Perform | 4:35.56 |
| 5 | 2 | C Coxeter-Smith | 99 | Guildford Ct | 4:46.24 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 4 | Kiani Campbell-Grady | 99 | Co Leeds | 4:46.98 |
| 1 | 6 | Sophie Evans | 99 | Bridgend Cty | 4:34.39 |
| 2 | 8 | Shannon McGahey | 99 | KingstonHull | 4:41.11 |
| 3 | 10 | Katie Parfitt | 99 | Aquae Sulis | 4:42.05 |
| 4 | 12 | Georgia Coates | 99 | Co Leeds | 4:30.67 |
| 5 | 11 | Jasmine Holmes | 99 | Poole | DN:C . |
| 6 | 9 | Loulou Vos | 99 | Hillingdon | 4:37.18 |
| 7 | 7 | Rose Foden | 99 | Northampton | 4:41.59 |
| 8 | 5 | Darcy Deakin | 99 | Co Sheffield | 4:39.65 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 16 | Siwan Thomas-Howells | 97 | Swim Swansea | DN:F . |
| 1 | 22 | Dervla Curran | 97 | KingstonHull | 4:28.12 |
| 2 | 28 | Rachel Williams | 93 | Bath Univ | 4:20.57 |
| 3 | 34 | Rachael Williamson | 95 | KingstonHull | 4:19.23 |
| 4 | 40 | Anne Bochmann | 93 | Bath Univ | 4:24.03 |
| 5 | 37 | Sycerika McMahon | 95 | Swim Ireland | DN:C . |
| 6 | 31 | Sian Morgan | 94 | Edinburgh Un | 4:22.88 |
| 7 | 25 | Chloe Hannam | 96 | Co Peterboro | DN:C . |
| 8 | 19 | Georgia Darwent | 98 | Co Newcastle | 4:28.22 |
| 9 | 13 | Emily Graham | 99 | Plymouth Lea | 4:41.86 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 17 | Philippa Shuttleworth | 97 | Hatfield | 4:29.94 |
| 1 | 23 | Grace Dennis | 96 | KingstonHull | 4:26.93 |
| 2 | 29 | Danielle Hall-Jackson | 94 | Co Leeds | 4:28.17 |
| 3 | 35 | Keri-Anne Payne | 87 | Warrender Ba | 4:17.33 |
| 4 | 41 | Jazmin Carlin | 90 | Swansea Uni | 4:13.85 |
| 5 | 38 | Sasha Matthews | 91 | Nova Cent'n | 4:13.24 |
| 6 | 32 | Sharon Van Rouwendaal | 93 | NED | 4:15.07 |
| 7 | 26 | Camilla Hattersley | 95 | Co Glasgow | 4:24.35 |
| 8 | 20 | Brearnna Close | 97 | Co Manch Aq | 4:26.88 |
| 9 | 14 | Holly Hibbott | 99 | Southport | 4:31.45 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 18 | Alice Dearing | 97 | Royal Wolv | 4:25.61 |
| 1 | 24 | Victoria Garlick | 94 | Co Manch Aq | 4:22.48 |
| 2 | 30 | Rebecca Turner | 92 | Co Sheffield | 4:16.89 |
| 3 | 36 | Hannah Miley | 89 | Garioch | 4:13.71 |
| 4 | 42 | Eleanor Faulkner | 93 | Co Sheffield | 4:14.80 |
| 5 | 39 | Aimee Willmott | 93 | Middlesboro | 4:15.22 |
| 6 | 33 | Lucy Charles | 93 | Hatfield | 4:17.00 |
| 7 | 27 | Lucinda Campbell | 96 | Windsor | 4:24.92 |
| 8 | 21 | Rebecca Murray | 97 | F.I.R.S.T. | 4:26.86 |
| 9 | 15 | Ellena Jones | 97 | Swim Swansea | 4:25.09 |