EVENT 511 Mixed 15 Yrs/Over 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Ellie Cox | 16 | Putteridge | 18:55.37 |
| 2 | 4 | Hannah Lovelock | 16 | Hitchin | 18:49.56 |
| 3 | 6 | Eveline Gaydon | 15 | Colchester | 18:43.90 |
| 4 | 8 | Amelia Saunders | 16 | St Felix Sch | 18:36.40 |
| 5 | 7 | Esmie Kidman | 18 | West Norfolk | 18:41.50 |
| 6 | 5 | Amelie Crabb | 17 | teamipswich | 18:46.30 |
| 7 | 3 | Antonia Elias | 15 | Hatfield | 18:53.00 |
| 8 | 1 | Francesca Barber | 15 | Co Norwich | 18:59.34 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Will Riley | 15 | teamipswich | 18:34.10 |
| 2 | 12 | Keira-Mae Ingram | 17 | Co St Albans | 18:23.84 |
| 3 | 14 | Finlay German | 15 | Co Cambridge | 18:21.17 |
| 4 | 16 | Cailin Hehir | 16 | Watford SC | 18:13.48 |
| 5 | 15 | Gabriella Troman | 15 | teamipswich | 18:20.10 |
| 6 | 13 | Charlie Duce | 15 | Bedford SS | 18:21.70 |
| 7 | 11 | Lily Hayward | 16 | Epping For't | 18:23.95 |
| 8 | 9 | Ava Black | 17 | Co St Albans | 18:36.31 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Harry Bird | 15 | Putteridge | 18:07.30 |
| 2 | 20 | Jamie Wilson | 15 | West Norfolk | 18:03.20 |
| 3 | 22 | Ever Ives | 15 | Hatfield | 17:59.36 |
| 4 | 24 | Callum Merrill | 15 | Chelmsford | 17:47.30 |
| 5 | 23 | Lisa Leinemann | 17 | Chelmsford | 17:55.79 |
| 6 | 21 | Charlie Cunningham | 15 | Biggleswade | 18:02.04 |
| 7 | 19 | Oliver Fenwick | 15 | Team Luton | 18:06.30 |
| 8 | 17 | Ashton Blake | 15 | Basildon Ph | 18:08.25 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 26 | Csanad Rehus | 15 | Co Peterboro | 17:39.83 |
| 2 | 28 | Alexa Mann | 18 | Chelmsford | 17:28.86 |
| 3 | 30 | Benjamin Every | 16 | St Felix Sch | 17:24.61 |
| 4 | 32 | George Carter | 16 | Co Cambridge | 17:19.36 |
| 5 | 31 | Chloe Barnard | 15 | Basildon Ph | 17:21.00 |
| 6 | 29 | Luke Martell | 18 | Watford SC | 17:24.80 |
| 7 | 27 | Adam O'Neal | 16 | Bedford SS | 17:29.80 |
| 8 | 25 | Jack Abram | 19 | Co Norwich | 17:44.00 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 34 | Jack Barnard | 19 | Watford SC | 17:12.76 |
| 2 | 36 | Talia Staines | 22 | Team Luton | 17:08.28 |
| 3 | 38 | Daniel Thompson | 17 | Thurrock | 17:02.65 |
| 4 | 40 | Robert Fenner | 16 | Basildon Ph | 16:55.56 |
| 5 | 39 | B Macdonald-Williams | 16 | Bishop Stort | 17:01.13 |
| 6 | 37 | Samuel Jeffrey | 17 | Hatfield | 17:04.91 |
| 7 | 35 | Conor Mint | 15 | Basildon Ph | 17:08.60 |
| 8 | 33 | Charlie McKinnon | 17 | St Felix Sch | 17:16.60 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 42 | Daniel Moyses | 18 | Co Peterboro | 16:50.80 |
| 2 | 44 | Patch Robinson | 17 | teamipswich | 16:38.70 |
| 3 | 46 | Orlando Dearing | 16 | Co Peterboro | 16:25.49 |
| 4 | 48 | Daniel McGuinness | 18 | Basildon Ph | 15:55.77 |
| 5 | 47 | Ryan Wall | 17 | Co Cambridge | 16:13.94 |
| 6 | 45 | Daniel Belsey | 16 | Hatfield | 16:26.33 |
| 7 | 43 | Cait Cotter | 17 | Chelmsford | 16:43.58 |
| 8 | 41 | Reece Burns | 16 | Chelmsford | 16:53.99 |