EVENT 1 Mixed 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Millie King | 16 | Derby Excel | 25:25.00 |
| 3 | 2 | Charlie Bisby | 13 | South Lincs | 25:24.00 |
| 4 | 3 | Holly Katasi | 14 | Co Milton K | 25:23.00 |
| 5 | 4 | Tyler Shaw | 13 | Derby Excel | 25:22.00 |
| 6 | 5 | Scarlett Howe | 14 | DerbyPhoenix | 25:21.00 |
| 7 | 6 | Elisabeth Kinnear | 14 | Grantham | 25:20.80 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Alice McMaster | 13 | Lincoln Vulc | 24:33.20 |
| 2 | 8 | Lauren McManus | 16 | Eckington | 22:59.30 |
| 3 | 9 | Amber Cowgill | 14 | Trafford Met | 21:28.30 |
| 4 | 10 | Ellena Howitt | 13 | Grantham | 21:18.90 |
| 5 | 11 | Lauren Keeton | 15 | Worksop | 21:06.50 |
| 6 | 12 | Isla Scott | 14 | Lincoln Vulc | 21:03.00 |
| 7 | 13 | Harriet McCormack | 15 | Grantham | 20:55.50 |
| 8 | 14 | Amy Taylor | 13 | Grantham | 20:50.70 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Charlotte Jenkinson | 14 | Deepings | 20:37.50 |
| 2 | 16 | Maya Almohammed | 14 | NottmLeander | 20:19.80 |
| 3 | 17 | Lucy Willatts | 13 | Grantham | 20:14.87 |
| 4 | 18 | Laurana Green | 14 | Worksop | 20:09.60 |
| 5 | 19 | Connie Bunhejee | 13 | Derby Excel | 20:05.61 |
| 6 | 20 | Esme Kerley | 16 | Swindon Dolp | 20:02.60 |
| 7 | 21 | James Huckle | 13 | Lincoln Vulc | 19:49.00 |
| 8 | 22 | Toby Drayson | 13 | BelperMarlin | 19:47.80 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | Francesco Monaco | 12 | South Lincs | 19:42.40 |
| 2 | 24 | Caitlin Leach | 16 | Radford | 19:37.59 |
| 3 | 25 | Olivia Male | 13 | Derby Excel | 19:32.31 |
| 4 | 26 | Kieran Lucy | 14 | South Lincs | 19:32.00 |
| 5 | 27 | Alexander Gaydon | 14 | Colchester | 19:19.89 |
| 6 | 28 | Elena Aldenhoff-Kelly | 16 | Grantham | 19:17.80 |
| 7 | 29 | Harry Vickers | 16 | Lincoln Vulc | 19:13.90 |
| 8 | 30 | Luke Dye | 15 | Kimberley | 19:06.08 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Holly Gent | 13 | Coalville | 19:05.30 |
| 2 | 32 | Eveline Gaydon | 15 | Colchester | 19:02.07 |
| 3 | 33 | Amy Walker | 15 | Worksop | 18:56.20 |
| 4 | 34 | Jack Hicks | 15 | Lincoln Vulc | 18:53.10 |
| 5 | 35 | James Cash | 14 | Deepings | 18:52.80 |
| 6 | 36 | Henry Jones | 15 | Dronfield | 18:49.97 |
| 7 | 37 | Matilda Hase | 17 | Derby Excel | 18:43.00 |
| 8 | 38 | Lawrence Chapman | 16 | Worksop | 18:35.37 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 40 | Chiara Reedha | 15 | Co Leicester | 18:27.00 |
| 2 | 42 | William Vere | 15 | South Lincs | 18:11.50 |
| 3 | 44 | Lucy Cadden | 20 | Derby Excel | 17:59.40 |
| 4 | 46 | Abby Mitchell | 18 | Co Leicester | 17:19.90 |
| 5 | 45 | Brodie Butlin | 15 | Sutton | 17:51.60 |
| 6 | 43 | Oliver Davies | 15 | Co Leicester | 17:59.70 |
| 7 | 41 | William Oxley | 14 | Co Leicester | 18:14.30 |
| 8 | 39 | Lillie Hamilton | 16 | South Lincs | 18:34.90 |