EVENT 201 Boys/Girls 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 3 | 1 | Maisie MATTHEWS | 11 | Louth | 22:38.09 |
| 4 | 3 | Amelia HATHWAY | 09 | Grantham | 22:09.78 |
| 5 | 2 | Sophie WARD | 09 | Grantham | 22:10.65 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 2 | 5 | Lucy LOVETT | 07 | Lincoln Vulc | 21:38.97 |
| 3 | 7 | Jessica HERRIOTT | 08 | South Lincs | 21:30.33 |
| 4 | 9 | Anna SIMMONS | 08 | Lincoln Vulc | 21:23.77 |
| 5 | 8 | Amelie MILLNS | 07 | Co Lincoln P | 21:27.36 |
| 6 | 6 | Megan LAMB | 09 | Lincoln Vulc | 21:34.17 |
| 7 | 4 | Skye HOLMES | 10 | Louth | 22:08.03 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 12 | Emily BRIGGS | 09 | South Lincs | 21:04.70 |
| 2 | 14 | Bethany WALKER | 96 | Deepings | 20:53.79 |
| 3 | 16 | Sophie COOKSEY | 10 | Louth | 20:52.03 |
| 4 | 18 | Erin INGHAM | 08 | Louth | 20:44.75 |
| 5 | 17 | Elodie HILES | 08 | Louth | 20:47.92 |
| 6 | 15 | Evie ROSCOE | 06 | Louth | 20:52.28 |
| 7 | 13 | Rianna ABBOTT | 08 | Grantham | 21:00.24 |
| 8 | 10 | Sophie MARSHALL | 05 | Co Lincoln P | 21:14.81 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 20 | Isabella MIDDLETON | 08 | Louth | 20:43.17 |
| 2 | 22 | Lexie HAMILTON | 09 | South Lincs | 20:16.59 |
| 3 | 24 | Olivia SPENCER | 06 | Lincoln Vulc | 20:06.17 |
| 4 | 26 | Helena FIELD | 09 | Louth | 20:05.40 |
| 5 | 25 | Lucy WILSON | 10 | South Lincs | 20:05.87 |
| 6 | 23 | Florrie HENSMAN | 09 | Louth | 20:10.45 |
| 7 | 21 | Megan BROWN | 09 | Grantham | 20:29.13 |
| 8 | 19 | Rosie HICKS | 06 | Lincoln Vulc | 20:44.23 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 28 | Elena ALDENHOFF-KELLY | 08 | Grantham | 20:03.69 |
| 2 | 30 | Archie FRENCH | 09 | Lincoln Vulc | 19:56.33 |
| 3 | 32 | Morgan FARRAR | 09 | Co Lincoln P | 19:48.59 |
| 4 | 34 | Evelyn JACKSON | 08 | Lincoln Vulc | 19:36.51 |
| 5 | 33 | Hannah BRUCE | 09 | South Lincs | 19:42.35 |
| 6 | 31 | Wynifred OWEN | 08 | Co Lincoln P | 19:49.65 |
| 7 | 29 | Lilli BOWMAN | 07 | South Lincs | 20:00.87 |
| 8 | 27 | William VERE | 09 | South Lincs | 20:03.85 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 36 | Olivia ANSTEY | 08 | Louth | 19:19.50 |
| 2 | 38 | Grace MACDONALD | 09 | Grantham | 19:07.58 |
| 3 | 40 | Evan NOORPURI | 07 | Lincoln Vulc | 19:06.94 |
| 4 | 42 | Alexandra HALLAM-STOTT | 06 | Grantham | 19:04.04 |
| 5 | 41 | Lillie HAMILTON | 08 | South Lincs | 19:05.15 |
| 6 | 39 | Jacob FISH | 09 | Grantham | 19:07.22 |
| 7 | 37 | Charlotte HODGIN | 08 | Co Lincoln P | 19:16.93 |
| 8 | 35 | Zara DIXON | 08 | Co Lincoln P | 19:31.60 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 44 | William TAYLOR | 08 | Louth | 19:00.70 |
| 2 | 46 | Chloe HOPKINSON | 05 | Grantham | 18:47.20 |
| 3 | 48 | Kieran NG | 10 | South Lincs | 18:31.86 |
| 4 | 50 | Matteo MONACO | 09 | South Lincs | 18:17.65 |
| 5 | 49 | Ryan NORTON | 07 | Boston | 18:29.35 |
| 6 | 47 | Beatrice FINCH | 06 | South Lincs | 18:35.37 |
| 7 | 45 | Katie MALONEY | 97 | Lincoln Vulc | 18:56.12 |
| 8 | 43 | Zach HOPKINSON | 09 | Grantham | 19:02.39 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 52 | Alexandra BULAT | 06 | Lincoln Vulc | 17:51.90 |
| 2 | 54 | Oliver SORRELL | 07 | South Lincs | 17:21.60 |
| 3 | 56 | Alex SADLER | 07 | South Lincs | 17:03.60 |
| 4 | 58 | Owen HATHWAY | 06 | Grantham | 16:54.90 |
| 5 | 57 | Alfie BISBY | 07 | South Lincs | 17:01.00 |
| 6 | 55 | Oscar GOLDSMITH | 08 | South Lincs | 17:05.97 |
| 7 | 53 | Joshua CLARKE | 08 | Grantham | 17:37.25 |
| 8 | 51 | Francesca HALLAM-STOTT | 07 | Grantham | 18:15.65 |