EVENT 211 Men/Women 11 Yrs/Over 400m Free. - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Mawulinam Ito | 11 | Co Cambridge | 5:54.20 |
| 3 | 3 | Maya Robu | 12 | Cheshunt | 5:46.71 |
| 4 | 5 | Gabriel Taggart | 12 | Watford SC | 5:40.82 |
| 5 | 4 | Niamh Bunker | 12 | Flitwick | 5:46.00 |
| 6 | 2 | Felipe Irvine | 12 | Watford SC | 5:51.24 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Lily-May Freeman | 12 | Gt Yarmouth | 5:36.10 |
| 2 | 9 | Grace Cook | 13 | Diss Otters | 5:33.90 |
| 3 | 11 | Selina Green | 13 | St Felix Sch | 5:28.70 |
| 4 | 13 | Aidan Scott | 13 | St Felix Sch | 5:27.15 |
| 5 | 12 | Lola Wonfor | 13 | New Hall | 5:28.13 |
| 6 | 10 | Megan Reader | 13 | Watford SC | 5:31.97 |
| 7 | 8 | Ella Townsend | 13 | Diss Otters | 5:35.10 |
| 8 | 6 | Anniston Coleman | 12 | Newmarket | 5:39.23 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Charlie Stott | 13 | Co St Albans | 5:24.82 |
| 2 | 17 | Aimee Burgess | 13 | teamipswich | 5:16.92 |
| 3 | 19 | Ella Deaton | 13 | Newmarket | 5:16.26 |
| 4 | 21 | Alexander Mordenti | 13 | Potters Bar | 5:15.49 |
| 5 | 20 | Bethany Rumsby | 13 | Norwich Swan | 5:15.70 |
| 6 | 18 | Emily Fitzgerald | 13 | Harlow Pen | 5:16.26 |
| 7 | 16 | Max Lesner | 13 | Potters Bar | 5:23.65 |
| 8 | 14 | Isla Black | 13 | Co St Albans | 5:26.88 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | Jack Beer | 13 | Linslade | 5:11.62 |
| 2 | 25 | Chloe Bellamy | 15 | West Norfolk | 5:07.90 |
| 3 | 27 | Lilia Clarkson | 15 | St Felix Sch | 5:06.86 |
| 4 | 29 | Isabel Collins | 16 | Bo Southend | 5:05.80 |
| 5 | 28 | Maisie Williams | 15 | Canvey Isl | 5:05.92 |
| 6 | 26 | Georgina Hamilton | 14 | Co St Albans | 5:07.03 |
| 7 | 24 | Isabel Moore | 14 | West Suffolk | 5:08.26 |
| 8 | 22 | Jasmine Pereira | 14 | Hatfield | 5:12.97 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Scarlett Joslin | 15 | Co Cambridge | 5:05.55 |
| 2 | 33 | Florence Talbot | 15 | Newmarket | 5:05.26 |
| 3 | 35 | Ava Black | 15 | Co St Albans | 5:02.59 |
| 4 | 37 | Eleanor McLeod | 14 | Putteridge | 5:02.20 |
| 5 | 36 | Autumn Shine | 15 | Potters Bar | 5:02.46 |
| 6 | 34 | Adam O'Neal | 14 | Modernian | 5:02.80 |
| 7 | 32 | Bethany Hamer | 15 | Linslade | 5:05.39 |
| 8 | 30 | Bethany Crawley | 14 | teamipswich | 5:05.70 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 39 | George Carter | 14 | Co Cambridge | 5:01.42 |
| 2 | 41 | Kiera Broad | 14 | West Suffolk | 5:01.03 |
| 3 | 43 | Olivia Lydon | 17 | Royston | 5:00.50 |
| 4 | 45 | Oscar Sherwani | 14 | Flitwick | 4:56.90 |
| 5 | 44 | Heidi Bruggraber | 15 | Co Cambridge | 5:00.01 |
| 6 | 42 | Ellie Eva | 18 | Hitchin | 5:00.79 |
| 7 | 40 | Marcie Aley | 16 | Braintree | 5:01.31 |
| 8 | 38 | Clara Foster | 15 | Linslade | 5:01.49 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 47 | F Cleland Ferdin | 14 | Co Cambridge | 4:53.98 |
| 2 | 49 | Elyn Lauder | 15 | West Norfolk | 4:53.30 |
| 3 | 51 | Ruby Chapman | 16 | Norwich Swan | 4:48.58 |
| 4 | 53 | Luke Martell | 16 | Potters Bar | 4:39.47 |
| 5 | 52 | Danny Foreman | 15 | Potters Bar | 4:43.74 |
| 6 | 50 | Phoebe Thorn | 16 | Flitwick | 4:49.89 |
| 7 | 48 | Esmie Kidman | 16 | West Norfolk | 4:53.70 |
| 8 | 46 | Emily Presland | 20 | Bushey | 4:54.02 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 55 | Cameron Jones | 16 | Leighton Buz | 4:38.80 |
| 2 | 57 | Thomas Deaton | 16 | Newmarket | 4:37.35 |
| 3 | 59 | Matthew Tatum | 21 | Diss Otters | 4:34.20 |
| 4 | 61 | Christopher Howe | 17 | Co Cambridge | 4:30.29 |
| 5 | 60 | Robert Addis | 18 | West Norfolk | 4:33.90 |
| 6 | 58 | Daniel Kendall | 16 | Co Ely | 4:35.36 |
| 7 | 56 | Harry Richardson | 18 | Southend | 4:37.55 |
| 8 | 54 | Charlie McKinnon | 15 | St Felix Sch | 4:39.22 |