EVENT 301 Mixed 12 Yrs/Under 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Theo SIRA | 10 | Co Leeds | 7:30.00 |
| 2 | 4 | Isabella HUTCHISON | 9 | Co Leeds | 7:20.00 |
| 3 | 6 | Max HASWELL | 11 | Co Leeds | 7:00.00 |
| 4 | 8 | Yin Ho Adrian CHAN | 10 | Co Leeds | 6:54.60 |
| 5 | 7 | Madeleine FLAHERTY | 10 | Co Leeds | 6:55.30 |
| 6 | 5 | Olive MITCHELL | 10 | Co Leeds | 7:07.90 |
| 7 | 3 | Emilia GRAVILLE | 10 | Co Leeds | 7:25.00 |
| 8 | 1 | Jessica DJIEGOUE | 11 | Co Leeds | 7:30.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 10 | Isabelle LOK | 10 | Co Leeds | 6:52.58 |
| 1 | 12 | Katie SADLER | 10 | Co Leeds | 6:46.00 |
| 2 | 14 | Jessica COLLEY | 11 | Co Leeds | 6:35.00 |
| 3 | 16 | Verity LILLEY | 12 | Co Leeds | 6:33.50 |
| 4 | 18 | Isabelle PARK | 10 | Co Leeds | 6:26.10 |
| 5 | 17 | George RICKETTS | 11 | Co Leeds | 6:27.90 |
| 6 | 15 | Evie COOK | 11 | Co Leeds | 6:34.50 |
| 7 | 13 | Amy BARKER | 11 | Lincoln Vulc | 6:40.00 |
| 8 | 11 | Ava MCLARKEY | 10 | Co Leeds | 6:50.00 |
| 9 | 9 | Grace OLDHAM | 11 | Co Leeds | 6:53.50 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 20 | Evelyn ATKINSON | 10 | Co Leeds | 6:19.01 |
| 1 | 22 | Madeline BECKRAM | 11 | Co Leeds | 6:13.60 |
| 2 | 24 | Liam LI | 10 | Co Leeds | 6:07.70 |
| 3 | 26 | Harrison WAKE | 12 | Co Leeds | 6:04.90 |
| 4 | 28 | Tyler RAVEN | 11 | Co Leeds | 5:59.10 |
| 5 | 27 | Amelia MATSON | 12 | Co Leeds | 6:04.60 |
| 6 | 25 | Livia STACEY | 12 | Co Leeds | 6:06.50 |
| 7 | 23 | Barney HOBBS | 11 | Co Leeds | 6:13.30 |
| 8 | 21 | Freya ELLIS | 12 | Co Leeds | 6:15.06 |
| 9 | 19 | Betsy KIRKLEY | 11 | Co Leeds | 6:23.90 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 30 | Hogan LAM | 12 | Co Leeds | 5:56.56 |
| 1 | 32 | Bethany MAKWEMBERE | 12 | Preston | 5:55.07 |
| 2 | 34 | Olaf GRUDOWSKI | 12 | Co Leeds | 5:49.90 |
| 3 | 36 | Oscar HUSSEY | 12 | Co Leeds | 5:40.30 |
| 4 | 38 | Leo LI | 12 | Co Leeds | 5:22.30 |
| 5 | 37 | Emily TALKES | 12 | Lincoln Vulc | 5:36.55 |
| 6 | 35 | Jessica ROLLINGS | 12 | Co Leeds | 5:41.00 |
| 7 | 33 | Olivia BYRNE | 12 | Bo Barnsley | 5:53.39 |
| 8 | 31 | Eva SYLVESTER | 12 | Co Leeds | 5:56.00 |
| 9 | 29 | Jacob JONES | 12 | Co Leeds | 5:58.15 |