EVENT 201 Female 14 Yrs/Over 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 2 | Victoria Hodgens | 14 | | Brentwood | 5:15.86 |
| 2 | 4 | Harlie Gardner | 14 | | Basildon Ph | 5:11.67 |
| 3 | 6 | Emmy Dearden | 14 | | Chelmsford | 5:08.79 |
| 4 | 8 | Aria Sabado | 14 | | Basildon Ph | 5:08.57 |
| 5 | 7 | Hannah Juggins | 15 | | Romford Town | 5:08.73 |
| 6 | 5 | Sophie White | 14 | | Basildon Ph | 5:09.85 |
| 7 | 3 | Zara Belnikoff | 14 | | Epping For't | 5:15.33 |
| 8 | 1 | Ziva Barrick | 17 | S9 | Colchester P | 6:03.06 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 10 | Florence Green | 14 | | Southend | 5:07.46 |
| 1 | 12 | Bridget Kelly | 14 | | Bo Waltham F | 5:07.07 |
| 2 | 14 | Keira Martin | 18 | | Canvey Isl | 5:04.50 |
| 3 | 16 | Paige Manley | 17 | | Southend | 5:04.18 |
| 4 | 18 | Bethany Curtis | 17 | | Colchester | 5:01.53 |
| 5 | 17 | Lilly Franks | 14 | | Thurrock | 5:01.89 |
| 6 | 15 | Poppy Tilley | 15 | | Harwich DP | 5:04.31 |
| 7 | 13 | Darcy Ford | 15 | | Hornchurch | 5:05.85 |
| 8 | 11 | Sophie Knevett | 16 | | Colchester | 5:07.19 |
| 9 | 9 | Angelique Grobler | 16 | | Rochford | 5:08.40 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 21 | Annabelle Hill | 15 | | Bo Newham | 4:57.83 |
| 1 | 23 | T Marinescu-Gaiu | 16 | | Bo Waltham F | 4:56.99 |
| 2 | 25 | Summer Lewis | 14 | | Colchester | 4:54.49 |
| 3 | 27 | Efa Fuller | 17 | | Colchester | 4:53.95 |
| 4 | 29 | Ava Sims | 15 | | Chelmsford | 4:52.53 |
| 5 | 28 | Freya Hill | 15 | | New Hall | 4:53.10 |
| 6 | 26 | Elizabeth Gore | 15 | | Epping For't | 4:54.30 |
| 7 | 24 | Brock Whiston | 30 | S8 | Bark & Dagen | 4:54.50 |
| 8 | 22 | Abigail Tilley | 14 | | Chelmsford | 4:57.29 |
| 9 | 19 | Chloe Parkins | 18 | | Southend | 5:01.11 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 31 | Sydney Lewis | 14 | | Colchester | 4:46.90 |
| 1 | 33 | Eveline Gaydon | 17 | | Chelmsford | 4:46.05 |
| 2 | 35 | Maisy Jeffery | 15 | | Killerwhales | 4:44.77 |
| 3 | 37 | Ava Turner | 17 | | Basildon Ph | 4:44.62 |
| 4 | 39 | Mia Wilson | 14 | | Basildon Ph | 4:40.12 |
| 5 | 38 | Isabella Da Silva | 15 | | Basildon Ph | 4:40.34 |
| 6 | 36 | Jeslene Sandhu | 15 | | Epping For't | 4:44.73 |
| 7 | 34 | Ayla Zolfaghari | 15 | | Epping For't | 4:45.10 |
| 8 | 32 | Meghan Howarth Owen | 17 | | Chelmsford | 4:46.15 |
| 9 | 30 | Alexa Ramirez | 15 | | Basildon Ph | 4:52.03 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 41 | Poppy Jeffery | 18 | | Killerwhales | 4:34.08 |
| 1 | 43 | Chloe Barnard | 17 | | Basildon Ph | 4:30.40 |
| 2 | 45 | Rebecca Coogan | 18 | | Thurrock | 4:29.40 |
| 3 | 47 | Alexa Mann | 20 | | DunmowAtlant | 4:22.50 |
| 4 | 49 | Jasmine Hall | 16 | | Basildon Ph | 4:15.80 |
| 5 | 48 | Amelia Fenner | 16 | | Basildon Ph | 4:20.86 |
| 6 | 46 | Summer Smith | 15 | | Basildon Ph | 4:28.26 |
| 7 | 44 | Alanna Henry | 15 | | Killerwhales | 4:30.35 |
| 8 | 42 | E Barth-Wehrenalp | 16 | | Chelmsford | 4:33.40 |
| 9 | 40 | Chloe Cranny | 15 | | Epping For't | 4:37.80 |