EVENT 403 Women's 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 3 | 1 | Hazel-Anne Carter | 08 | Wycombe Dist | 4:30.19 |
| 4 | 3 | Sophie Benn | 07 | Mt Kelly | 4:29.96 |
| 5 | 2 | Annabel Pilgrim | 06 | Guildford Ct | 4:30.04 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 4 | Amber Downham | 05 | Co Manch Aq | 4:29.91 |
| 1 | 6 | Rebecca Reid | 02 | Aberdeen | 4:29.72 |
| 2 | 8 | Millie Patterson | 06 | Swansea Uni | 4:29.68 |
| 3 | 10 | Katherine Noble | 08 | Newcastle | 4:29.54 |
| 4 | 12 | Grace Cummings | 06 | Thanet Swim | 4:29.42 |
| 5 | 11 | Eve Leleux | 03 | Wrekin SC | 4:29.44 |
| 6 | 9 | Harriet Oxley | 05 | Repton | 4:29.57 |
| 7 | 7 | Natasha De Pree | 07 | Millfield | 4:29.69 |
| 8 | 5 | Rosie Richards | 06 | Rushmoor Ryl | 4:29.75 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 14 | Abby Mitchell | 06 | Co Leicester | 4:29.13 |
| 1 | 16 | Ella Blocksidge | 06 | Co Salford | 4:29.12 |
| 2 | 18 | Ella Smith | 09 | N & D PP SC | 4:28.98 |
| 3 | 20 | Kerry Hennie | 08 | Co Liverpool | 4:28.62 |
| 4 | 22 | Alice Young | 08 | Guildford Ct | 4:28.51 |
| 5 | 21 | Mollie Fisher | 05 | Co Manch Aq | 4:28.59 |
| 6 | 19 | Alice Forrest | 09 | N & D PP SC | 4:28.75 |
| 7 | 17 | Maisie Dickinson | 07 | Wycombe Dist | 4:29.01 |
| 8 | 15 | Pearle Griffiths | 03 | SurreyUni SC | 4:29.12 |
| 9 | 13 | Zara Krawiec | 09 | East Lothian | 4:29.15 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 24 | Elizabeth Land | 09 | Newcastle | 4:28.39 |
| 1 | 26 | Annabelle Compton | 08 | Wycombe Dist | 4:28.11 |
| 2 | 28 | Livia Kingsland | 05 | Nova Cent'n | 4:27.72 |
| 3 | 30 | Lillie Grover | 07 | Royal Wolv | 4:27.67 |
| 4 | 32 | Emily Johnson | 06 | Millfield | 4:27.49 |
| 5 | 31 | Lucy Parsons | 07 | Co Liverpool | 4:27.56 |
| 6 | 29 | Isla Roberts | 08 | Hackney | 4:27.67 |
| 7 | 27 | Sophie Main | 04 | Edinburgh Un | 4:27.98 |
| 8 | 25 | Emily Maxwell | 07 | N & D PP SC | 4:28.19 |
| 9 | 23 | Emily Forwood | 04 | Swansea Uni | 4:28.49 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 34 | Sedona Reed | 07 | Co Leeds | 4:27.30 |
| 1 | 36 | Isla Jones | 07 | Co Sheffield | 4:27.17 |
| 2 | 38 | Anna Farrow | 05 | Bath Univ | 4:26.93 |
| 3 | 40 | Abbie Roscoe | 09 | Wirral Metro | 4:26.83 |
| 4 | 42 | Libby Freeman | 06 | N & D PP SC | 4:26.38 |
| 5 | 41 | Evangeline Stacey | 07 | Co Leeds | 4:26.41 |
| 6 | 39 | Liberty Gordon | 04 | Rushmoor Ryl | 4:26.86 |
| 7 | 37 | Eleanor Kay | 06 | Bolton Metro | 4:27.14 |
| 8 | 35 | Georgia Robertson | 05 | Co Sheffield | 4:27.24 |
| 9 | 33 | Darcey Smith | 10 | Portsmouth N | 4:27.41 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 44 | Hannah Hodgkiss | 06 | Repton | 4:26.20 |
| 1 | 46 | Jess Widdowson | 06 | Co Leeds | 4:25.96 |
| 2 | 48 | Isabelle Jopson | 03 | Lboro Uni | 4:25.35 |
| 3 | 50 | Jessica Arundale | 05 | Barnet Copt | 4:25.26 |
| 4 | 52 | Elizabeth Warner | 10 | Co Leeds | 4:24.95 |
| 5 | 51 | Katie Lee | 08 | Co Salford | 4:25.24 |
| 6 | 49 | Madison Emment | 07 | Repton | 4:25.34 |
| 7 | 47 | Emilia John | 07 | Co Cardiff | 4:25.37 |
| 8 | 45 | Nicole Ryan | 98 | Guildford Ct | 4:26.01 |
| 9 | 43 | Tsala Bernholt | 06 | Barnet Copt | 4:26.20 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 54 | Ava Cook | 08 | Co Sheffield | 4:24.89 |
| 1 | 56 | Erin Little | 05 | Mt Kelly | 4:24.25 |
| 2 | 58 | Ruby Griffiths | 06 | Mt Kelly | 4:23.75 |
| 3 | 60 | Phoebe Arbuckle | 08 | Warrender Ba | 4:22.88 |
| 4 | 62 | Aimee Monks | 05 | Swansea Uni | 4:22.61 |
| 5 | 61 | Mairi Craig | 04 | Edinburgh Un | 4:22.83 |
| 6 | 59 | Katherine Bailey | 04 | UniOfStirl | 4:23.05 |
| 7 | 57 | Scarlett Orchard | 03 | Lboro Uni | 4:23.82 |
| 8 | 55 | Cait Cotter | 07 | Chelmsford | 4:24.65 |
| 9 | 53 | Jessica Smelt | 07 | Repton | 4:24.89 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 65 | Molly Baker | 07 | Co Sheffield | 4:21.75 |
| 1 | 69 | Ella Dyson | 04 | Wycombe Dist | 4:18.90 |
| 2 | 73 | Lucy Fox | 06 | Wycombe Dist | 4:16.05 |
| 3 | 77 | Jessica Podger | 01 | Millfield | 4:15.32 |
| 4 | 81 | Amelie Blocksidge | 09 | Co Salford | 4:12.95 |
| 5 | 79 | Shannon Stott | 00 | Co Sheffield | 4:13.87 |
| 6 | 75 | Jemima Hall | 01 | Bath Univ | 4:15.99 |
| 7 | 71 | Hollie Wilson | 08 | Co Leeds | 4:18.25 |
| 8 | 67 | Anya Preece | 03 | Derby Excel | 4:20.59 |
| 9 | 63 | Phyllida Britton | 97 | Ealing | 4:22.51 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 66 | Henrietta D'Ammassa | 05 | Co Manch Aq | 4:20.81 |
| 1 | 70 | Megan Barnes | 03 | Mt Kelly | 4:18.71 |
| 2 | 74 | Holly Hibbott | 99 | Bath PC | 4:16.00 |
| 3 | 78 | Michaella Glenister | 02 | UniOfStirl | 4:14.56 |
| 4 | 82 | Leah Crisp | 01 | Bath PC | 4:12.85 |
| 5 | 80 | Mia Slevin | 03 | Lboro Uni | 4:13.35 |
| 6 | 76 | Fleur Lewis | 03 | Lboro Uni | 4:15.85 |
| 7 | 72 | Beatrice Varley | 03 | Plymouth Lea | 4:16.87 |
| 8 | 68 | Phoebe Cooper | 08 | Co Sheffield | 4:19.49 |
| 9 | 64 | Emma Price | 08 | N & D PP SC | 4:22.38 |