EVENT 201 Mixed 09 Yrs/Over 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Henry DOLAN | 11 | Grantham | 7:45.80 |
| 3 | 3 | Leila MARANDI | 10 | Retford | 7:30.00 |
| 4 | 5 | Emmeline GLEAVE | 9 | Grantham | 7:00.00 |
| 5 | 4 | Thomas KINNEAR | 13 | Grantham | 7:00.00 |
| 6 | 2 | Hollie-Anne CROOK | 10 | Grantham | 7:45.80 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Lizzy LERESCHE HANDS | 12 | Grantham | 6:51.63 |
| 2 | 9 | Arthur SAMMUT | 12 | Co Lincoln P | 6:40.00 |
| 3 | 11 | Lucy ABBOTT | 12 | Grantham | 6:34.80 |
| 4 | 13 | Robyn STEEL | 11 | Co Lincoln P | 6:30.00 |
| 5 | 12 | Miley RICHARDSON | 11 | Co Lincoln P | 6:30.00 |
| 6 | 10 | Lexie SHEWAN | 14 | Grantham | 6:36.85 |
| 7 | 8 | Lottie Ava FLATTERS | 12 | Deepings | 6:43.40 |
| 8 | 6 | Edda SCHUERCH | 45 | Co Lincoln P | 7:00.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Emilija IVANOVA | 15 | Boston | 6:20.86 |
| 2 | 17 | Oliver CLARKE | 12 | Deepings | 6:17.00 |
| 3 | 19 | Grace HOWITT | 15 | Grantham | 5:59.42 |
| 4 | 21 | Cole COOPER | 12 | Co Lincoln P | 5:50.00 |
| 5 | 20 | Sophie MARSHALL | 19 | Co Lincoln P | 5:52.55 |
| 6 | 18 | Ellena HOWITT | 13 | Grantham | 6:00.19 |
| 7 | 16 | Emilia THORNLEY-PAYNE | 16 | Boston | 6:20.77 |
| 8 | 14 | Emily PENNELL | 14 | Co Lincoln P | 6:30.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | Chris WILLERTON | 40 | Skegness | 5:44.86 |
| 2 | 25 | Amy PALMER | 13 | Co Lincoln P | 5:40.00 |
| 3 | 27 | Matthew MENZER | 17 | Co Wakefield | 5:35.00 |
| 4 | 29 | Ryan NORTON | 17 | Boston | 5:04.13 |
| 5 | 28 | Oliver GARNER | 14 | Co Lincoln P | 5:32.34 |
| 6 | 26 | Isla GRAY | 14 | Grantham | 5:38.51 |
| 7 | 24 | Erin ARCHER | 13 | Co Lincoln P | 5:40.00 |
| 8 | 22 | Lucy WILLATTS | 12 | Grantham | 5:49.10 |