EVENT 301 Female 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Jasmine Scott | 14 | Co St Albans | 5:24.90 |
| 4 | 3 | Chloe Cranny | 14 | Epping For't | 5:24.50 |
| 5 | 2 | Hannah Lovelock | 17 | Hitchin | 5:24.58 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | Eliza Jennings | 13 | Biggleswade | 5:24.10 |
| 2 | 6 | Nicole Peddelty | 15 | teamipswich | 5:23.31 |
| 3 | 8 | Mia Nelson | 14 | Cheshunt | 5:22.60 |
| 4 | 10 | Bethany Crawley | 17 | teamipswich | 5:20.82 |
| 5 | 9 | Amelia Porzio | 17 | Putteridge | 5:20.84 |
| 6 | 7 | Esmie Kidman | 19 | West Norfolk | 5:22.84 |
| 7 | 5 | Daisy-Mai Doel | 14 | Basildon Ph | 5:23.90 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | Summer Miller | 13 | Bishop Stort | 5:16.85 |
| 2 | 14 | Emma Cushion | 15 | Co Peterboro | 5:15.90 |
| 3 | 16 | Isabella Porzio | 21 | Putteridge | 5:09.33 |
| 4 | 18 | Lois Smith | 15 | Basildon Ph | 5:05.79 |
| 5 | 17 | Poppy Magill | 17 | Putteridge | 5:07.38 |
| 6 | 15 | Georgina Hamilton | 17 | Co St Albans | 5:12.30 |
| 7 | 13 | Isla Stewart | 15 | Co Peterboro | 5:15.90 |
| 8 | 11 | Alice Watts | 17 | Co Cambridge | 5:18.45 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 20 | Summer Evason | 16 | Watford SC | 5:00.87 |
| 2 | 22 | Lexie O'Connor | 18 | Basildon Ph | 4:58.62 |
| 3 | 24 | Chloe Barnard | 16 | Basildon Ph | 4:56.33 |
| 4 | 26 | Jasmine Hall | 15 | Basildon Ph | 4:54.67 |
| 5 | 25 | Lilly Davis | 18 | Co Peterboro | 4:56.20 |
| 6 | 23 | Sadie Hunter | 17 | Co Peterboro | 4:58.10 |
| 7 | 21 | Annie McLeod | 17 | Putteridge | 5:00.35 |
| 8 | 19 | Chloe Butler | 21 | Norwich Swan | 5:05.25 |