EVENT 202 Mixed 09 Yrs/Over 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Ava MORGAN | 11 | Co Lincoln P | 8:00.00 |
| 3 | 2 | Leo FRANCZAK | 9 | Co Lincoln P | 8:00.00 |
| 4 | 3 | Florence MCCLURE | 10 | Lincoln TSA | 7:30.00 |
| 5 | 4 | Norahh MOE-AUNG | 11 | Grantham | 7:30.00 |
| 6 | 5 | Ralph MILNE | 10 | Grantham | 7:30.00 |
| 7 | 6 | Esmé EVANS | 11 | Grantham | 7:29.67 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Maksim ROMANOVSKIJ | 10 | Newark | 7:26.00 |
| 2 | 8 | Matias MIGLIORINO | 9 | Newark | 7:16.00 |
| 3 | 9 | Annabel HILLSON | 10 | Grantham | 7:15.00 |
| 4 | 10 | Liberty HAGGAR | 10 | Newark | 7:15.00 |
| 5 | 11 | Florence HARPER | 12 | Grantham | 7:08.97 |
| 6 | 12 | Abigail TAYLOR | 11 | Grantham | 7:02.22 |
| 7 | 13 | Olivia CHARITY | 13 | Grantham | 7:01.60 |
| 8 | 14 | Elizabeth FAHEY | 11 | Newark | 7:00.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Evelyn NICHOLLS | 11 | Grantham | 7:00.00 |
| 2 | 16 | William PENNOCK | 11 | Grantham | 6:55.20 |
| 3 | 17 | Liam EDMEADES | 10 | Deepings | 6:55.00 |
| 4 | 18 | Haiden IP | 12 | Newark | 6:36.00 |
| 5 | 19 | Ruby NISBET | 11 | Newark | 6:32.97 |
| 6 | 20 | Violet NISBET | 14 | Newark | 6:32.36 |
| 7 | 21 | Matilda MCDONNELL | 12 | Grantham | 6:30.56 |
| 8 | 22 | Harrison ABLITT | 10 | Co Lincoln P | 6:30.40 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | Honey FLOWER | 11 | Grantham | 6:30.00 |
| 2 | 24 | Caitlynn EDMEADES | 11 | Deepings | 6:25.67 |
| 3 | 25 | Benjamin GODDARD | 12 | Grantham | 6:23.80 |
| 4 | 26 | Freya HUGHES | 12 | Co Lincoln P | 6:20.81 |
| 5 | 27 | Hollie-Ann CROOK | 11 | Grantham | 6:14.61 |
| 6 | 28 | Louis WRIGHT | 12 | Grantham | 6:12.44 |
| 7 | 29 | Annabel SHEPHERD | 13 | Deepings | 6:12.31 |
| 8 | 30 | Charlotte GOSLING | 16 | Newark | 6:11.37 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Ava-Grace GREGORY | 13 | Grantham | 6:04.90 |
| 2 | 32 | Ella KHAMA | 11 | Grantham | 5:58.55 |
| 3 | 33 | Florence MONAGHAN | 13 | Lincoln TSA | 5:57.12 |
| 4 | 34 | Isla ROBINSON | 11 | Co Lincoln P | 5:55.55 |
| 5 | 35 | Sebastian MADDISON | 14 | Co Lincoln P | 5:50.00 |
| 6 | 36 | Arthur BREARLEY-NEWSOM | 14 | Grantham | 5:47.84 |
| 7 | 37 | Eva MADDISON | 11 | Co Lincoln P | 5:45.00 |
| 8 | 38 | Leo BARNETT | 13 | Grantham | 5:42.19 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 39 | Isaac FAHEY | 13 | Newark | 5:40.00 |
| 2 | 40 | Grace HOWITT | 16 | Grantham | 5:33.04 |
| 3 | 41 | Jimmin BAO | 12 | Grantham | 5:32.33 |
| 4 | 42 | Jack MARTIN | 16 | Newark | 5:31.08 |
| 5 | 43 | Tristan EKE | 14 | Co Lincoln P | 5:30.58 |
| 6 | 44 | Lucia CHIVERS | 13 | Newark | 5:29.82 |
| 7 | 45 | Luke MARTIN | 16 | Newark | 5:27.23 |
| 8 | 46 | Iris FRENCH | 15 | Lincoln Vulc | 5:26.91 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 47 | Lexie SHEWAN | 15 | Grantham | 5:23.11 |
| 2 | 48 | Noah SKINNER | 14 | Deepings | 5:22.50 |
| 3 | 49 | Freya SHARPE | 13 | Lincoln Vulc | 5:20.24 |
| 4 | 50 | Evie NEWMAN | 12 | Lincoln Vulc | 5:18.02 |
| 5 | 51 | Ruby WHITEHEAD | 15 | Newark | 5:15.85 |
| 6 | 52 | Katherine FLETCHER | 12 | Loughborough | 5:11.79 |
| 7 | 53 | Ellena HOWITT | 14 | Grantham | 5:04.65 |
| 8 | 54 | Jessica - Rose DAVISON | 15 | Grantham | 5:01.59 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 56 | Lucy WILLATTS | 13 | Grantham | 4:43.70 |
| 2 | 58 | Daniel HEPPLESTONE | 15 | Co Lincoln P | 4:32.78 |
| 3 | 60 | Morgan FARRAR | 16 | Co Lincoln P | 4:23.98 |
| 4 | 62 | Joshua CLARKE | 17 | Grantham | 4:13.00 |
| 5 | 61 | Zach HOPKINSON | 16 | Grantham | 4:21.37 |
| 6 | 59 | Grace TURNER | 18 | Grantham | 4:27.50 |
| 7 | 57 | Luke DAYBELL | 16 | Grantham | 4:33.73 |
| 8 | 55 | Isla GRAY | 15 | Grantham | 4:48.18 |