EVENT 302 Women MC 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 2 | 1 | Maisie MATTHEWS | 11 | Louth | 5:37.22 |
| 3 | 3 | Amy PALMER | 11 | Co Lincoln P | 5:31.80 |
| 4 | 5 | Zoe PARSONS | 09 | Lincoln TSA | 5:26.81 |
| 5 | 4 | Elysia SMITH | 10 | Louth | 5:30.21 |
| 6 | 2 | Kitty LAMB | 11 | South Lincs | 5:34.30 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 7 | Emily TALKES | 12 | Lincoln Vulc | 5:24.13 |
| 2 | 9 | Sophie COOKSEY | 10 | Louth | 5:22.00 |
| 3 | 11 | Corey FARLEY | 09 | Grantham | 5:17.22 |
| 4 | 13 | Elodie HILES | 08 | Louth | 5:16.90 |
| 5 | 12 | Emmy STINTON | 09 | Co Lincoln P | 5:17.19 |
| 6 | 10 | Lexie HAMILTON | 09 | South Lincs | 5:20.00 |
| 7 | 8 | Megan LAMB | 09 | Lincoln Vulc | 5:23.46 |
| 8 | 6 | Skye HOLMES | 10 | Louth | 5:24.37 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 15 | Penelope BAXTER | 05 | Deepings | 5:12.46 |
| 2 | 17 | Helena FIELD | 09 | Louth | 5:08.58 |
| 3 | 19 | Olivia SPENCER | 06 | Lincoln Vulc | 5:07.16 |
| 4 | 21 | Gracie-May COLE | 08 | Co Lincoln P | 5:06.75 |
| 5 | 20 | Charlotte BEMROSE | 08 | Louth | 5:07.00 |
| 6 | 18 | Samantha MACIJAUSKAITE | 05 | Boston | 5:08.03 |
| 7 | 16 | Lucy WILSON | 10 | South Lincs | 5:09.43 |
| 8 | 14 | Amy STRATTON | 05 | Boston | 5:13.43 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 23 | Evie DICKINSON | 08 | Louth | 5:05.29 |
| 2 | 25 | Erin INGHAM | 08 | Louth | 5:05.10 |
| 3 | 27 | Lillie HAMILTON | 08 | South Lincs | 4:58.49 |
| 4 | 29 | Amelia CHRISPIN | 05 | Lincoln Vulc | 4:56.80 |
| 5 | 28 | Evie LILLEY | 09 | Lincoln Vulc | 4:56.88 |
| 6 | 26 | Lilli BOWMAN | 07 | South Lincs | 4:59.58 |
| 7 | 24 | Madeleine SMIRTHWAITE | 08 | Co Lincoln P | 5:05.15 |
| 8 | 22 | Florrie HENSMAN | 09 | Louth | 5:05.48 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 31 | Zara DIXON | 08 | Co Lincoln P | 4:54.74 |
| 2 | 33 | Jessica O'HERLIHY | 06 | South Lincs | 4:53.18 |
| 3 | 35 | Alexandra HALLAM-STOTT | 06 | Grantham | 4:52.93 |
| 4 | 37 | Lilli-Rose CARR | 09 | Co Lincoln P | 4:51.86 |
| 5 | 36 | Grace MACDONALD | 09 | Grantham | 4:52.38 |
| 6 | 34 | Hannah BRUCE | 09 | South Lincs | 4:53.04 |
| 7 | 32 | Elena ALDENHOFF-KELLY | 08 | Grantham | 4:53.84 |
| 8 | 30 | Evelyn JACKSON | 08 | Lincoln Vulc | 4:56.56 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 39 | Charlotte HODGIN | 08 | Co Lincoln P | 4:50.67 |
| 2 | 41 | Francesca HALLAM-STOTT | 07 | Grantham | 4:36.99 |
| 3 | 43 | Alexandra BULAT | 06 | Lincoln Vulc | 4:26.20 |
| 4 | 45 | Emma CROKER | 05 | South Lincs | 4:23.53 |
| 5 | 44 | Megan SPEIRS | 04 | Co Lincoln P | 4:23.70 |
| 6 | 42 | Mollie BRIGGS | 05 | South Lincs | 4:33.50 |
| 7 | 40 | Chloe HOPKINSON | 05 | Grantham | 4:41.80 |
| 8 | 38 | Olivia ANSTEY | 08 | Louth | 4:51.62 |