EVENT 432 Open/Male 50m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 3 | 2 | Finlay German | 15 | | Co Cambridge | |
| 4 | 4 | Kabir Patel | 15 | | Potters Bar | |
| 5 | 3 | Ramsey Gill | 15 | | Co St Albans | |
| 6 | 1 | Ashton Lowe | 15 | | Saffron Wald | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 6 | William Ward | 15 | | Hoddesdon | |
| 2 | 8 | Jamie Wilson | 15 | | West Norfolk | |
| 3 | 10 | Alfie Bullock | 16 | | Cheshunt | |
| 4 | 12 | Rafferty May | 16 | | Watford SC | |
| 5 | 11 | Theodore Monk | 16 | | Co Cambridge | |
| 6 | 9 | Osehon Ojiekhudu | 15 | | Thurrock | |
| 7 | 7 | Harry Bird | 15 | | Putteridge | |
| 8 | 5 | Alfie Rowland | 15 | | Stowmarket | |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 14 | Lee Boka | 16 | | Basildon Ph | |
| 2 | 16 | Nonso Nwabueze | 15 | | Bo Southend | |
| 3 | 18 | Rhys Thomas | 16 | | Linslade | |
| 4 | 20 | Reece Burns | 16 | | Chelmsford | |
| 5 | 19 | Hayden Garrod | 16 | | Team Waveney | |
| 6 | 17 | Aiden Futter | 16 | | Norwich Swan | |
| 7 | 15 | Zilvinas Simkus | 16 | | Co Peterboro | |
| 8 | 13 | Jan Beblot | 15 | | Norwich Swan | |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 22 | Marcus King | 16 | | Putteridge | |
| 2 | 24 | Daniel De Filippo | 15 | | Flitwick | |
| 3 | 26 | Ayobami Akindele | 16 | | Thurrock | |
| 4 | 28 | James McGettigan | 15 | | Thurrock | |
| 5 | 27 | Frank Jacob | 15 | | Co Cambridge | |
| 6 | 25 | Naim Harvey | 16 | | Basildon Ph | |
| 7 | 23 | Oliver Davey | 15 | | Co Cambridge | |
| 8 | 21 | Volodymyr Ignatiev | 15 | | Bishop Stort | |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 30 | Freddie Gardner | 18 | | Thurrock | |
| 2 | 32 | Sam Mead | 22 | | Linslade | |
| 3 | 34 | Liam Barnett | 37 | | Co Cambridge | |
| 4 | 36 | Finlay Arnup | 17 | | Norwich Swan | |
| 5 | 35 | Joshua Sackree | 16 | | Co Peterboro | |
| 6 | 33 | Maxwell Hozier | 15 | | Hoddesdon | |
| 7 | 31 | Billy Cyl | 16 | | Ware | |
| 8 | 29 | Harry Cooper | 16 | | Bo Southend | |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 38 | Ewan Thompson | 18 | | St Ives | |
| 2 | 40 | Ryan Ingram | 16 | | Co St Albans | |
| 3 | 42 | Lewis Andrews | 17 | | Norwich Swan | |
| 4 | 44 | Theo Bari | 16 | | Saffron Wald | |
| 5 | 43 | Jack Osborne | 17 | | Deben | |
| 6 | 41 | Nathan Close | 18 | | Bedford SS | |
| 7 | 39 | Daniel Williams | 16 | | Hatfield | |
| 8 | 37 | Jude Gunner | 15 | S14 | St Felix Sch | |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 46 | Lazaros Giarenis | 15 | | Co Norwich | |
| 2 | 48 | Jake Lloyd | 29 | | Bishop Stort | |
| 3 | 50 | Luke Morley | 17 | | Hitchin | |
| 4 | 52 | Noah Mann | 17 | | Newmarket | |
| 5 | 51 | Rio Rogers | 20 | S14 | Basildon Ph | |
| 6 | 49 | Dylan Nutt | 25 | | DunmowAtlant | |
| 7 | 47 | Rhys Burrell | 17 | | West Norfolk | |
| 8 | 45 | Oliver Baskerville | 16 | | Hatfield | |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 54 | Charlie Stanbury | 19 | | Potters Bar | |
| 2 | 56 | Harry Hudson | 19 | | Norfolk Vikg | |
| 3 | 58 | Billy Mead | 19 | | Linslade | |
| 4 | 60 | Benedict Measures | 19 | | Norwich Swan | |
| 5 | 59 | James Noble | 22 | | Norwich Swan | |
| 6 | 57 | Riley Bashford | 18 | | Deben | |
| 7 | 55 | Ronnie Edwards | 16 | | Rochford | |
| 8 | 53 | Thomas Hamilton | 23 | | Co Cambridge | |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 62 | Joshua Needham | 17 | | St Neot Swan | |
| 2 | 64 | Samuel Rose | 21 | | West Norfolk | |
| 3 | 66 | Robert Addis | 20 | | West Norfolk | |
| 4 | 68 | Harrison Shaw | 17 | | Flitwick | |
| 5 | 67 | Ethan Martin | 19 | | Thurrock | |
| 6 | 65 | Joe Power | 17 | | Basildon Ph | |
| 7 | 63 | Jack Barnard | 19 | | Watford SC | |
| 8 | 61 | Finlay Neve | 16 | | Co Norwich | |
| Heat Number - 10 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 72 | Oliver Pike | 17 | | Co Norwich | |
| 2 | 78 | Ryan Close | 16 | | Bedford SS | |
| 3 | 84 | Callum Davis | 24 | | Bishop Stort | |
| 4 | 90 | Henry Dean | 18 | | Thurrock | |
| 5 | 87 | Thomas Liddiard | 18 | | Ware | |
| 6 | 81 | Lewis Chapman | 23 | | Stowmarket | |
| 7 | 75 | Timon Chapman | 22 | | Norwich Swan | |
| 8 | 69 | Sean Connolly | 16 | | Epping For't | |
| Heat Number - 11 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 73 | Tobias Oglesby | 20 | | West Norfolk | |
| 2 | 79 | Joshua Parker | 15 | | Braintree | |
| 3 | 85 | Jake Thomas-Mansfield | 24 | | West Suffolk | |
| 4 | 91 | Maddox Roberts | 18 | | Witham Dolph | |
| 5 | 88 | Harry Jones | 24 | | Co Norwich | |
| 6 | 82 | Nathan Wells | 26 | | West Norfolk | |
| 7 | 76 | Charlie Barrett | 23 | | Co Norwich | |
| 8 | 70 | Devesh Kapoor | 21 | | Co Norwich | |
| Heat Number - 12 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 74 | Riley Hall | 17 | | Co Cambridge | |
| 2 | 80 | Rufus Bennett | 16 | | Co Peterboro | |
| 3 | 86 | Joseph Bavey | 19 | | Newmarket | |
| 4 | 92 | Matthew Wright | 26 | | Team Luton | |
| 5 | 89 | Joshua Shepherd | 16 | | Thurrock | |
| 6 | 83 | Jack Abram | 19 | | Co Norwich | |
| 7 | 77 | Zach Townend | 21 | | Co Norwich | |
| 8 | 71 | Daryl Rands | 27 | | Colchester | |