EVENT 303 Women MC 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Cat | Club | Time |
| 1 | 1 | Siomha BRADY | 06 | S8 | Ireland | |
| 2 | 2 | Nicole TURNER | 02 | S6 | Ireland | |
| 3 | 3 | Aleksandra MIKHAILOVA | 03 | S10 | Russia | |
| 4 | 4 | Maisie CATT | 09 | S7 | RichmondDale | 7:36.75 |
| 5 | 5 | Elizabeth FOSTER | 04 | S7 | Havant & Wat | 6:32.86 |
| 6 | 6 | Samantha LEWIS | 92 | S8 | Satellite | 6:32.05 |
| 7 | 7 | Scarlett HUMPHREY | 05 | S11 | GBR - NHNA | 6:25.80 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Cat | Club | Time |
| 0 | 8 | Fern SNEDDON | 06 | S6 | RTW Monson | 6:24.09 |
| 1 | 9 | Abigail WICKENS | 07 | S8 | Flitwick | 6:16.73 |
| 2 | 10 | Madeleine HARRIS | 03 | S9 | Elmbridge | 6:14.94 |
| 3 | 11 | Eliza HUMPHREY | 05 | S11 | GBR - NHNA | 6:11.56 |
| 4 | 12 | Rachael PARTINGTON | 05 | S6 | Alsager | 5:50.49 |
| 5 | 13 | Astrid CARROLL | 09 | S13 | Bo Kirklees | 5:47.62 |
| 6 | 14 | Katie PAKE | 08 | S10 | Carnegie | 5:46.63 |
| 7 | 15 | Charlotte HYDE | 02 | S7 | GBR - ENSL | 5:39.65 |
| 8 | 16 | Meghan WILLIS | 07 | S10 | GBR - TDOY | 5:28.75 |
| 9 | 17 | Eva FRENCH | 07 | S10 | GBR - NUMN | 5:23.92 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Cat | Club | Time |
| 0 | 18 | Maisie SUMMERS-NEWTON | 02 | S6 | GBR - NHNA | 5:23.65 |
| 1 | 19 | Rebecca LEWIS | 03 | S10 | GBR - RCTY | 5:20.69 |
| 2 | 20 | Amber HAYCOCK | 07 | S10 | GBR - RUSA | 5:18.21 |
| 3 | 21 | Amy SHERIDAN | 04 | S9 | Ireland | 5:15.79 |
| 4 | 22 | Arianna HUNSICKER | 03 | S10 | Canada | 5:09.85 |
| 5 | 23 | Mira Jeanne MAACK | 04 | S8 | Germany | 5:07.55 |
| 6 | 24 | Nahia ZUDAIRE BORREZO | 04 | S9 | Spain | 5:06.00 |
| 7 | 25 | Roisin NI RIAIN | 05 | S13 | Ireland | 4:44.09 |
| 8 | 26 | Toni SHAW | 03 | S9 | GBR - WUSX | 4:39.32 |
| 9 | 27 | Zara MULLOOLY | 02 | S10 | GBR - LUAE | 4:34.91 |