EVENT 108 Womens MC 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 3 | 1 | Lily MACLEOD | 17 | S13 | Mt Kelly | 4:53.56 |
| 4 | 2 | Josephine KLEIN | 13 | | Exeter City | 4:39.70 |
| 5 | 3 | Aegean BRAMLEY | 17 | | Caradon | 4:39.53 |
| 6 | 4 | Ella BARDGETT | 14 | | Plymouth Lea | 4:37.77 |
| 7 | 5 | Megan ADAMSON | 15 | | Swindon Dolp | 4:36.10 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 2 | 6 | Caitlin GULLIVER | 14 | | Swindon Dolp | 4:36.10 |
| 3 | 7 | Lana BROEKHOVEN | 15 | | Plymouth Lea | 4:35.10 |
| 4 | 8 | Samantha HAMMOND | 16 | | Team Bath AS | 4:34.90 |
| 5 | 9 | Lydia CRAWFORD | 14 | | Team Bath AS | 4:34.60 |
| 6 | 10 | Alexandra PALOTAI-AVEL | 14 | | S Bournem'th | 4:34.30 |
| 7 | 11 | Scarlett ORCHARD | 15 | | Mt Kelly | 4:33.90 |
| 8 | 12 | Erin SHEWCHUK | 15 | | Swindon Dolp | 4:33.12 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 13 | Thalia POAROS | 17 | | Mt Kelly | 4:32.54 |
| 2 | 14 | Teagan-Mae GRAHAM | 17 | | Poole | 4:31.10 |
| 3 | 15 | Sophie MAIN | 14 | | Mt Kelly | 4:28.60 |
| 4 | 16 | Megan VINGOE | 16 | | Carn Brea | 4:28.30 |
| 5 | 17 | Polly PAINTER | 16 | | Millfield | 4:26.20 |
| 6 | 18 | Misty MARSHALL-WELLING | 17 | | Team Bath AS | 4:25.70 |
| 7 | 19 | Gaurika SINGH | 16 | | Mt Kelly | 4:25.61 |
| 8 | 20 | Olivia BUTLER | 15 | | Co Bristol | 4:21.45 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 22 | Molly FRANCIS | 17 | | Mt Kelly | 4:20.60 |
| 2 | 24 | Jessica PODGER | 17 | | Millfield | 4:20.20 |
| 3 | 26 | Franka WILKE | 16 | | Plymouth Lea | 4:17.98 |
| 4 | 28 | Rachel ANDERSON | 16 | | Millfield | 4:13.00 |
| 5 | 27 | Laura STEPHENS | 19 | | Plymouth Lea | 4:13.60 |
| 6 | 25 | Georgina DENNIS | 16 | | Mt Kelly | 4:18.40 |
| 7 | 23 | Thea O'KEEFE | 18 | | Poole | 4:20.40 |
| 8 | 21 | Sophie FREEMAN | 14 | | Plymouth Lea | 4:20.90 |