EVENT 204 Mixed 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Pela TIAN-WRIGHT | 13 | South Lincs Competitive SC | 24:18.06 |
| 3 | 3 | Lauren MCMANUS | 15 | Eckington SC | 23:03.87 |
| 4 | 2 | Alice MCMASTER | 12 | Lincoln Vulcans SC | 23:50.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Maisie ASMAN | 13 | Lincoln Vulcans SC | 22:13.85 |
| 2 | 7 | Iris FRENCH | 13 | Lincoln Vulcans SC | 22:04.61 |
| 3 | 9 | Charlotte TURNER | 13 | Lincoln Vulcans SC | 21:46.21 |
| 4 | 8 | Joshua BUTTERWORTH | 14 | Lincoln Vulcans SC | 21:50.00 |
| 5 | 6 | Chelsea TODD | 13 | Lincoln Vulcans SC | 22:07.63 |
| 6 | 4 | Emily HUNT | 13 | Lincoln Vulcans SC | 22:15.04 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Charlotte JENKINSON | 13 | Deepings SC | 21:09.21 |
| 2 | 13 | Iona WATSON | 14 | Bassetlaw Swim Squad | 19:50.76 |
| 3 | 15 | Layne KEYWORTH | 15 | Bassetlaw Swim Squad | 16:00.00 |
| 4 | 14 | Alex SADLER | 17 | South Lincs Competitive SC | 17:03.60 |
| 5 | 12 | Samuel POTTER | 14 | Bassetlaw Swim Squad | 19:55.44 |
| 6 | 10 | Isla SCOTT | 13 | Lincoln Vulcans SC | 21:10.54 |