EVENT 411 Womens 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 2 | 2 | Sophie FREEMAN | 11 | Colchester | 5:05.35 |
| 3 | 4 | Ella HALE | 12 | West Suffolk | 5:04.66 |
| 4 | 6 | Isabelle SANDFORD | 12 | Basildon Ph | 5:03.60 |
| 5 | 5 | Libby MAGILL | 12 | Hatfield | 5:03.88 |
| 6 | 3 | Olivia LEE | 11 | Co Peterboro | 5:05.08 |
| 7 | 1 | Eve WRIGHT | 12 | Co Peterboro | 5:05.46 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 8 | Jessica PATRICK | 12 | Co St Albans | 4:58.80 |
| 2 | 10 | Annabelle BURGESS | 12 | teamipswich | 4:57.48 |
| 3 | 12 | Lauren YOUNG | 12 | Team Luton | 4:56.70 |
| 4 | 14 | Jessica TURLEY | 13 | Hatfield | 4:55.50 |
| 5 | 13 | Katy CHAMBERS | 13 | St Felix Sch | 4:56.10 |
| 6 | 11 | Niamh PERRY | 13 | West Suffolk | 4:57.05 |
| 7 | 9 | Emma CRUICKSHANKS | 12 | teamipswich | 4:57.94 |
| 8 | 7 | Grace MADSEN | 12 | UEA Norwich | 4:59.83 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 16 | Georgia PURKIS | 13 | Hemel Hemp | 4:54.04 |
| 2 | 18 | Lucy BAILEY | 13 | Rochford | 4:53.90 |
| 3 | 20 | Jennifer READ | 13 | West Norfolk | 4:53.80 |
| 4 | 22 | Sophie PAYNE | 13 | Hatfield | 4:53.34 |
| 5 | 21 | Abbie BARNWELL | 12 | Team Luton | 4:53.50 |
| 6 | 19 | Lauren THOMAS | 13 | Mid Beds | 4:53.80 |
| 7 | 17 | Nicole CHANDLER | 13 | teamipswich | 4:54.03 |
| 8 | 15 | Natasha BENTLEY | 13 | Hatfield | 4:54.50 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 24 | Lauren STOTT | 13 | Co St Albans | 4:52.51 |
| 2 | 26 | Amber HEAD | 13 | Rochford | 4:52.10 |
| 3 | 28 | Mackenzie WHYATT | 13 | Co Peterboro | 4:51.34 |
| 4 | 30 | Lucie PECK | 12 | UEA Norwich | 4:50.10 |
| 5 | 29 | Rachel FAULKNER | 14 | UEA Norwich | 4:51.08 |
| 6 | 27 | Megan WILTSHIRE-LASTRA | 13 | St Felix Sch | 4:51.45 |
| 7 | 25 | Chloe MOLONEY | 13 | DunmowAtlant | 4:52.48 |
| 8 | 23 | Eloise SNEDDON | 12 | Colchester | 4:52.80 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 32 | Mia CARTER | 13 | Bishop Stort | 4:48.70 |
| 2 | 34 | Erin LEE | 13 | Basildon Ph | 4:47.50 |
| 3 | 36 | Maisie EASTER | 13 | UEA Norwich | 4:46.32 |
| 4 | 38 | Megan PYE | 13 | UEA Norwich | 4:45.55 |
| 5 | 37 | Tia GARDINER | 13 | Chelmsford | 4:45.90 |
| 6 | 35 | Grace WYLIE | 14 | Co St Albans | 4:47.17 |
| 7 | 33 | Holly JASZKIEWICZ | 14 | Co Peterboro | 4:47.70 |
| 8 | 31 | Jade GOODE | 12 | Co Peterboro | 4:49.30 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 40 | Ellie RUNNALLS | 13 | Chelmsford | 4:43.80 |
| 2 | 42 | Megan KEY | 14 | Canvey Isl | 4:42.60 |
| 3 | 44 | Mia LEECH | 13 | Co Peterboro | 4:42.41 |
| 4 | 46 | Rebecca KITCHING | 14 | Chelmsford | 4:40.64 |
| 5 | 45 | Anna BLAKELEY | 13 | Co Peterboro | 4:42.05 |
| 6 | 43 | Kaelah LAWSON | 13 | Modernians | 4:42.60 |
| 7 | 41 | Annabelle KITCHING | 13 | Chelmsford | 4:42.90 |
| 8 | 39 | Bryony UMFREVILLE | 14 | Basildon Ph | 4:44.83 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 48 | Tia WILSON | 13 | Modernians | 4:38.80 |
| 2 | 50 | Charlotte WALKER | 13 | UEA Norwich | 4:36.39 |
| 3 | 52 | Tilly ANEMA | 14 | Norwich Swan | 4:34.60 |
| 4 | 54 | Maddison SAUNDERS | 14 | Co Peterboro | 4:32.60 |
| 5 | 53 | Chloe LENCE | 14 | Modernians | 4:34.30 |
| 6 | 51 | Aiyana LAWSON | 14 | Modernians | 4:36.10 |
| 7 | 49 | Poppy RICHARDSON | 14 | Co Peterboro | 4:37.00 |
| 8 | 47 | Sophie TAYLOR | 14 | St Felix Sch | 4:40.40 |