EVENT 521 Mixed 11/14 Yrs 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Aaron Rawnsley | 12 | Harpenden | 21:58.55 |
| 4 | 4 | Brooke Ptolomey | 12 | Putteridge | 21:47.20 |
| 5 | 3 | Mylo Molloy | 12 | Co St Albans | 21:57.13 |
| 6 | 1 | Matilda Sharpe | 12 | Co Norwich | 22:05.30 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | India Clement | 12 | West Suffolk | 21:25.20 |
| 2 | 8 | Riccardo Di Maria | 12 | Co Norwich | 21:10.30 |
| 3 | 10 | Sydney Lewis | 12 | Colchester | 20:38.20 |
| 4 | 12 | James O'Toole | 13 | Co Norwich | 20:28.76 |
| 5 | 11 | Alfie Ritchie | 13 | Co St Albans | 20:35.34 |
| 6 | 9 | Alice Buckingham | 11 | Team Luton | 20:39.00 |
| 7 | 7 | Todd Leung | 12 | Hatfield | 21:24.54 |
| 8 | 5 | Skye Freeman | 12 | Norwich Swan | 21:27.80 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | Jacob Wild | 13 | Newmarket | 20:14.00 |
| 2 | 16 | Montgomery Brewster | 12 | Watford SC | 20:08.73 |
| 3 | 18 | Ethan Woolsey | 13 | St Neot Swan | 20:06.09 |
| 4 | 20 | Charlotte Stewart | 12 | Co St Albans | 20:03.92 |
| 5 | 19 | Olivia Croft | 13 | Cheshunt | 20:04.25 |
| 6 | 17 | Millie Tomlin | 13 | Basildon Ph | 20:06.16 |
| 7 | 15 | Ava Sims | 13 | Chelmsford | 20:11.72 |
| 8 | 13 | Mia Wilson | 12 | Basildon Ph | 20:19.90 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 22 | Zoe Watson | 14 | Basildon Ph | 19:53.76 |
| 2 | 24 | Lucy Wilson | 14 | Co Peterboro | 19:45.33 |
| 3 | 26 | Mia Nelson | 13 | Cheshunt | 19:34.80 |
| 4 | 28 | Nicole Cashin | 14 | Team Luton | 19:25.51 |
| 5 | 27 | Olivia Palmer | 14 | Co Norwich | 19:27.00 |
| 6 | 25 | Byron Miller | 13 | teamipswich | 19:42.50 |
| 7 | 23 | Jeslene Sandhu | 13 | Epping For't | 19:52.43 |
| 8 | 21 | Nicholas Mitroi | 13 | Thurrock | 19:57.86 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 30 | Ayla Zolfaghari | 13 | Epping For't | 19:02.79 |
| 2 | 32 | Alexander Gaydon | 14 | Colchester | 19:02.00 |
| 3 | 34 | Oliver Meier | 14 | Biggleswade | 18:54.80 |
| 4 | 36 | George Saunders | 14 | Team Luton | 18:44.90 |
| 5 | 35 | Megan Barnicoat | 13 | Bedford SS | 18:52.80 |
| 6 | 33 | Corben Gibson | 14 | Basildon Ph | 18:59.78 |
| 7 | 31 | Ivan Ijomoni | 13 | Thurrock | 19:02.65 |
| 8 | 29 | Constantine Calliafas | 13 | Watford SC | 19:21.05 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 38 | William Hughes | 14 | Basildon Ph | 18:42.90 |
| 2 | 40 | Attila Mozes | 14 | teamipswich | 18:41.30 |
| 3 | 42 | Janos Csepely | 13 | teamipswich | 18:36.60 |
| 4 | 44 | Luke Owens | 14 | Putteridge | 18:31.93 |
| 5 | 43 | Oliver Fuller | 14 | Co Cambridge | 18:32.22 |
| 6 | 41 | Kian Ptolomey | 14 | Putteridge | 18:39.89 |
| 7 | 39 | Cassandra Pereira | 14 | Hatfield | 18:42.54 |
| 8 | 37 | Daisy Jubb | 14 | Co St Albans | 18:43.80 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 46 | Charlie Birdsall | 14 | Co Cambridge | 18:28.08 |
| 2 | 48 | Cheuk-Kin Lau | 14 | Co St Albans | 18:12.69 |
| 3 | 50 | Kieran Ng | 14 | Co Peterboro | 17:49.31 |
| 4 | 52 | Jacob Bacon | 14 | Co Peterboro | 17:07.66 |
| 5 | 51 | Jasmine Hall | 14 | Basildon Ph | 17:31.60 |
| 6 | 49 | Ellie Barth-Wehrenalp | 14 | Basildon Ph | 18:06.08 |
| 7 | 47 | Amelia Fenner | 14 | Basildon Ph | 18:17.91 |
| 8 | 45 | Haiden Hall | 14 | Deben | 18:30.30 |