EVENT 511 Mixed 15 Yrs/Over 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Milly Johnson | 15 | West Norfolk | 19:12.85 |
| 3 | 4 | Isabel Thomas | 17 | Newmarket | 18:42.30 |
| 4 | 6 | Daisy Jubb | 15 | Co St Albans | 18:38.48 |
| 5 | 5 | Esmie Kidman | 19 | West Norfolk | 18:41.50 |
| 6 | 3 | Hannah Lovelock | 17 | Hitchin | 18:49.56 |
| 7 | 1 | Hoi Ching Kong | 15 | Co St Albans | 19:16.01 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Emma Cushion | 15 | Co Peterboro | 18:36.30 |
| 2 | 10 | Lily Hayward | 17 | Epping For't | 18:24.60 |
| 3 | 12 | Amelie Crabb | 18 | teamipswich | 18:23.40 |
| 4 | 14 | E Barth-Wehrenalp | 15 | Chelmsford | 18:19.80 |
| 5 | 13 | Ava Black | 18 | Co St Albans | 18:22.28 |
| 6 | 11 | Francesca Barber | 16 | Co Norwich | 18:23.62 |
| 7 | 9 | Charlie Birdsall | 15 | Co Cambridge | 18:28.08 |
| 8 | 7 | Cassandra Pereira | 15 | Watford SC | 18:37.20 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Oliver Meier | 15 | Biggleswade | 18:12.16 |
| 2 | 18 | Amelia Saunders | 17 | Norwich Swan | 18:00.55 |
| 3 | 20 | Max Lesner | 16 | Potters Bar | 17:57.86 |
| 4 | 22 | Will Riley | 16 | teamipswich | 17:47.80 |
| 5 | 21 | Millie Richardson | 19 | Hatfield | 17:57.50 |
| 6 | 19 | Anabelle Kett | 16 | Co Peterboro | 17:59.58 |
| 7 | 17 | Ethan Wallis | 15 | Norwich Swan | 18:09.56 |
| 8 | 15 | Summer Evason | 16 | Watford SC | 18:17.70 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 24 | Kian Ptolomey | 15 | Putteridge | 17:45.40 |
| 2 | 26 | Cailin Hehir | 17 | Watford SC | 17:42.56 |
| 3 | 28 | Oliver Fuller | 15 | Co Cambridge | 17:40.84 |
| 4 | 30 | Luke Owens | 15 | Putteridge | 17:40.50 |
| 5 | 29 | Oliver Tom | 18 | Bishop Stort | 17:40.58 |
| 6 | 27 | Lochlan Shaw | 15 | Flitwick | 17:42.10 |
| 7 | 25 | Gabriella Troman | 16 | teamipswich | 17:45.09 |
| 8 | 23 | Tyler Stone | 15 | Co Norwich | 17:47.30 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 32 | Amelia Fenner | 15 | Basildon Ph | 17:19.30 |
| 2 | 34 | Sophie Dowding | 18 | teamipswich | 17:15.54 |
| 3 | 36 | George Carter | 17 | Co Cambridge | 17:05.87 |
| 4 | 38 | Samuel Jeffrey | 18 | Hatfield | 17:04.91 |
| 5 | 37 | Daniel Thompson | 18 | Thurrock | 17:05.70 |
| 6 | 35 | Jamie Wilson | 16 | West Norfolk | 17:14.70 |
| 7 | 33 | Ryan Wimpenny | 15 | Cheshunt | 17:17.54 |
| 8 | 31 | Lucas Day | 16 | Rochford | 17:37.28 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 40 | Jasmine Hall | 15 | Basildon Ph | 17:02.25 |
| 2 | 42 | Daniel Moyses | 19 | Co Peterboro | 17:01.20 |
| 3 | 44 | Daniel Williams | 17 | Hatfield | 16:45.81 |
| 4 | 46 | Luke Martell | 19 | Watford SC | 16:42.61 |
| 5 | 45 | B Macdonald-Williams | 17 | Bishop Stort | 16:42.74 |
| 6 | 43 | Csanad Rehus | 16 | Co Peterboro | 16:59.05 |
| 7 | 41 | Oliver Fenwick | 16 | Hatfield | 17:01.33 |
| 8 | 39 | Frank Lamb | 16 | Co Peterboro | 17:04.43 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 48 | Robert Fenner | 17 | Basildon Ph | 16:34.10 |
| 2 | 50 | George Hooper | 18 | Co St Albans | 16:29.62 |
| 3 | 52 | Adam O'Neal | 17 | Bedford SS | 16:28.36 |
| 4 | 54 | Ryan Wall | 18 | Co Cambridge | 16:16.40 |
| 5 | 53 | Daniel Belsey | 17 | Hatfield | 16:19.41 |
| 6 | 51 | Conor Mint | 16 | Basildon Ph | 16:29.40 |
| 7 | 49 | Patch Robinson | 18 | teamipswich | 16:31.11 |
| 8 | 47 | Jacob Bacon | 15 | Co Peterboro | 16:37.30 |