EVENT 201 Female 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 3 | 1 | Elsie BALDWIN | 13 | Hinckley | 6:47.25 |
| 4 | 3 | Rochelle MOORE | 13 | Coalville | 6:33.14 |
| 5 | 2 | Emmie-Rose POWER | 13 | Hinckley | 6:39.49 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 6 | Erika CLARKE | 11 | Leic Peng | 6:16.16 |
| 2 | 8 | Matilda BOTT | 12 | Hinckley | 6:12.93 |
| 3 | 10 | Ivanna BEREST | 11 | Loughborough | 6:12.77 |
| 4 | 13 | Isabella DERBYSHIRE | 13 | Leic Sharks | 6:10.26 |
| 5 | 12 | Isla FOWLER | 13 | Coalville | 6:10.96 |
| 6 | 9 | India SAWYER | 12 | Coalville | 6:12.81 |
| 7 | 7 | Ellie POULTON-BURBANK | 11 | Loughborough | 6:13.31 |
| 8 | 5 | Ivy LOWE | 12 | Leicester Ne | 6:17.46 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 15 | Aimee FRASER | 09 | Hinckley | 6:09.69 |
| 2 | 18 | Emilia DURRINGTON | 10 | Braunstone | 6:03.70 |
| 3 | 20 | Sophie BRUTNALL | 11 | Market Har | 6:02.85 |
| 4 | 22 | Laura GRAHAM-BROWN | 11 | Leic Peng | 6:01.71 |
| 5 | 21 | Myla DIZON | 11 | Braunstone | 6:01.86 |
| 6 | 19 | Sophie WRIGHT | 09 | Hinckley | 6:03.58 |
| 7 | 16 | Harriet JENNINGS | 13 | Market Har | 6:09.02 |
| 8 | 14 | Georgia DAVIES | 11 | Hinckley | 6:09.85 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 24 | Peta MORLEY | 11 | Hinckley | 5:57.56 |
| 2 | 26 | Emma BREAG | 09 | Melton M'bry | 5:55.12 |
| 3 | 28 | Isabelle WALCZAK | 08 | Leic Peng | 5:54.12 |
| 4 | 30 | Abigail GOLYNKER | 10 | Leic Sharks | 5:53.70 |
| 5 | 29 | Milen MERRITT | 12 | Melton M'bry | 5:53.84 |
| 6 | 27 | Elizabeth BAINES | 10 | Hinckley | 5:54.57 |
| 7 | 25 | Sofia REEDHA | 11 | Braunstone | 5:56.61 |
| 8 | 23 | Sophie LANE | 12 | Leic Sharks | 5:58.00 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 32 | Lucy DONAGHEY | 07 | Leic Peng | 5:51.79 |
| 2 | 34 | Ava HARVEY | 09 | Leic Sharks | 5:49.65 |
| 3 | 36 | Ava STEANS | 10 | Hinckley | 5:41.65 |
| 4 | 39 | Chloe MORLEY | 12 | Coalville | 5:31.32 |
| 5 | 37 | Nicola MICHALSKA | 11 | Leic Sharks | 5:38.75 |
| 6 | 35 | Megan BLAIR | 11 | Coalville | 5:42.10 |
| 7 | 33 | Eleanor TRAHEARN | 09 | Hinckley | 5:49.92 |
| 8 | 31 | Jessica PURSER | 11 | Braunstone | 5:52.74 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 42 | Zoe ELLIS | 09 | Leic Sharks | 5:26.63 |
| 2 | 44 | Jessica OXLEY | 09 | Braunstone | 5:18.18 |
| 3 | 46 | Jessica LINES | 09 | Leic Sharks | 5:13.04 |
| 4 | 48 | Janie FINCH | 10 | Hinckley | 4:55.15 |
| 5 | 47 | Holly GENT | 11 | Coalville | 5:11.72 |
| 6 | 45 | Kate ANDREWS | 08 | Braunstone | 5:13.91 |
| 7 | 43 | Chloe GENT | 10 | Coalville | 5:24.41 |
| 8 | 41 | Julia JOZWIAK | 08 | Leic Sharks | 5:29.52 |