EVENT 303 Open/Male 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Michal KOCHANOWICZ | 11 | Corby | 2:50.50 |
| 3 | 3 | Dylan BEGLEY | 10 | Market Har | 2:00.00 |
| 4 | 5 | Jacob CLIFFE | 12 | Hinckley | 1:53.40 |
| 5 | 4 | Linards JERMAKS | 12 | Wellingboro | 1:55.20 |
| 6 | 2 | Dorian MARAFKO | 14 | Corby | 2:05.60 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | George WARD | 12 | Newport Pag | 1:44.90 |
| 2 | 9 | Percy GREEN | 11 | Corby | 1:42.93 |
| 3 | 11 | Finley KING | 12 | Wellingboro | 1:41.20 |
| 4 | 13 | Samuel HICKS | 13 | Hinckley | 1:35.50 |
| 5 | 12 | Oliver TRENWITH | 11 | Corby | 1:39.10 |
| 6 | 10 | Jesunefe ABEKE | 14 | Corby | 1:42.20 |
| 7 | 8 | Oscar PAWLOWSKI | 10 | Corby | 1:44.80 |
| 8 | 6 | Oscar CUTMORE | 11 | Corby | 1:45.10 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Cameron HUGHES | 12 | Wellingboro | 1:34.30 |
| 2 | 17 | Jenson WISEMAN-HAY | 14 | Corby | 1:33.09 |
| 3 | 19 | Owen HEMMINGS-KNELLER | 13 | Wellingboro | 1:31.56 |
| 4 | 21 | Joel WIFFEN | 15 | Corby | 1:30.35 |
| 5 | 20 | Renars JERMAKS | 15 | Wellingboro | 1:30.90 |
| 6 | 18 | Ronnie SHIPTON | 15 | Wellingboro | 1:32.90 |
| 7 | 16 | Rahul REEDHA | 11 | Co Leicester | 1:33.20 |
| 8 | 14 | David URSACHI | 11 | Co Leicester | 1:35.10 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | Joshua HAYWARD | 14 | Newport Pag | 1:28.80 |
| 2 | 25 | Liam LOVITT | 14 | Wellingboro | 1:28.00 |
| 3 | 27 | Noah PATTERSON | 11 | Wellingboro | 1:25.90 |
| 4 | 29 | James KIRBY | 17 | Hinckley | 1:25.10 |
| 5 | 28 | Izaiah FAMUTIMI | 13 | Leic Sharks | 1:25.40 |
| 6 | 26 | Aiden HORNE | 12 | Corby | 1:26.70 |
| 7 | 24 | Michael FRASER | 13 | Hinckley | 1:28.40 |
| 8 | 22 | Lucas WILLIS-CULPITT | 12 | Leic Sharks | 1:29.49 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Rhys HO | 13 | Newport Pag | 1:23.70 |
| 2 | 33 | John GRAHAM-BROWN | 12 | Co Leicester | 1:22.80 |
| 3 | 35 | Daniel MUSTATA | 13 | Corby | 1:19.30 |
| 4 | 37 | Zachary FRASER | 14 | Wellingboro | 1:18.30 |
| 5 | 36 | Oscar UFTON | 15 | Wellingboro | 1:18.80 |
| 6 | 34 | Daniel GIBB | 13 | Newport Pag | 1:21.70 |
| 7 | 32 | Alex BARTLAM | 14 | Co Leicester | 1:23.50 |
| 8 | 30 | Jacob TYRRELL | 13 | Co Leicester | 1:24.50 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 39 | Austin GRAHAM | 12 | Co Leicester | 1:17.40 |
| 2 | 41 | Frank BACON | 14 | Co Leicester | 1:16.40 |
| 3 | 43 | Theo BLACK | 14 | Leic Sharks | 1:16.10 |
| 4 | 45 | Lucas KRYNAUW | 15 | Wellingboro | 1:14.30 |
| 5 | 44 | Cameron HIGGS | 14 | Newport Pag | 1:15.10 |
| 6 | 42 | Mason TRAYNOR | 11 | Co Leicester | 1:16.30 |
| 7 | 40 | Clay TUFFLEY-STEELE | 15 | Market Har | 1:17.20 |
| 8 | 38 | Jakub KOWALCZYK | 13 | Hinckley | 1:17.70 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 47 | Aaron MOUNTFORD | 14 | Wellingboro | 1:11.90 |
| 2 | 49 | Sebastian CASEY | 14 | Hinckley | 1:09.80 |
| 3 | 51 | Julian CASEY | 18 | Hinckley | 1:09.50 |
| 4 | 53 | Ron ELKIN | 16 | Corby | 1:07.93 |
| 5 | 52 | Harrison THORPE | 17 | Leic Sharks | 1:08.70 |
| 6 | 50 | Ethan DICK | 15 | Newport Pag | 1:09.70 |
| 7 | 48 | Jack ROBERTSON | 15 | Corby | 1:10.00 |
| 8 | 46 | Joseph GREAVES | 17 | Corby | 1:14.23 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 55 | Bobby PHILLIPS | 19 | Wellingboro | 1:06.40 |
| 2 | 57 | Connor ALLEN | 17 | Wellingboro | 1:05.30 |
| 3 | 59 | Tyler HOLLYMAN | 17 | Corby | 1:03.00 |
| 4 | 61 | Ethan RANDALL | 18 | Corby | 1:00.70 |
| 5 | 60 | Samuel COOKE | 18 | Corby | 1:02.64 |
| 6 | 58 | Ethan SOPPETT-MOSS | 15 | Corby | 1:03.30 |
| 7 | 56 | Finley DARE | 15 | Corby | 1:05.40 |
| 8 | 54 | Marshall GOLDER | 14 | Hinckley | 1:07.40 |