EVENT 420 Boys Open 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 2 | 1 | Bhaveshsingh PARMESSUR | 10 | Leicester Ne | 2:02.59 |
| 3 | 3 | Callum PIGGOTT | 12 | Shrewsbury | 1:57.00 |
| 4 | 5 | Benjamin BOURNE | 12 | Coalville | 1:45.75 |
| 5 | 4 | Sammy RAHIMZADEH | 11 | Nova Cent'n | 1:46.57 |
| 6 | 2 | Umar HASHIM | 11 | Leicester Ne | 1:58.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 7 | Evan MCWHIRTER | 11 | Co Coventry | 1:38.43 |
| 2 | 9 | Oliver AFIA | 12 | Nova Cent'n | 1:33.14 |
| 3 | 11 | Sean MCCANN | 11 | Co Leicester | 1:31.90 |
| 4 | 13 | Joseph LUND | 12 | Deepings | 1:30.05 |
| 5 | 12 | Joseph BROWBANK | 11 | Co Leicester | 1:30.17 |
| 6 | 10 | Daniel KENNEDY | 12 | Co Leicester | 1:32.86 |
| 7 | 8 | Jake JUNGMANN | 13 | Deepings | 1:38.12 |
| 8 | 6 | Owen THOMPSON | 14 | Shrewsbury | 1:38.48 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 15 | Andrew HALL | 13 | Nova Cent'n | 1:20.70 |
| 2 | 17 | Christopher SNEESBY | 14 | Co Leicester | 1:18.73 |
| 3 | 19 | Sandy JARVIS | 14 | Loughborough | 1:17.65 |
| 4 | 21 | Frankie ALDRIDGE | 13 | Co Leicester | 1:13.86 |
| 5 | 20 | Jonathan HARRISON | 15 | Coalville | 1:14.37 |
| 6 | 18 | Kieran BOTT | 13 | Co Leicester | 1:18.52 |
| 7 | 16 | Adam TILLEY | 13 | Co Leicester | 1:19.86 |
| 8 | 14 | Stanley ALEXANDER | 12 | Co Leicester | 1:21.21 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 23 | Kai BACON | 13 | Co Leicester | 1:13.44 |
| 2 | 25 | George DEARDEN | 14 | Co Leicester | 1:10.70 |
| 3 | 27 | Rakshansingh PARMESSUR | 15 | Leicester Ne | 1:09.45 |
| 4 | 29 | Finlay CHAPMAN | 15 | Braunstone | 1:08.84 |
| 5 | 28 | William PARSONS | 14 | Hinckley | 1:08.93 |
| 6 | 26 | James PERROTT | 18 | Loughborough | 1:10.29 |
| 7 | 24 | James WATSON | 14 | Co Leicester | 1:13.30 |
| 8 | 22 | Charlie KALETHA | 12 | Co Leicester | 1:13.78 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 31 | Colin O'REILLY | 17 | South Lincs | 1:07.18 |
| 2 | 33 | Jacob SHINTON | 15 | Northgate | 1:06.13 |
| 3 | 35 | Samuel WILKINSON | 16 | Melton M'bry | 1:04.11 |
| 4 | 37 | William GRAHAM | 15 | Melton M'bry | 1:02.48 |
| 5 | 36 | Rhys CHILES | 17 | Co Leicester | 1:04.00 |
| 6 | 34 | Benjamin BEEDELL | 14 | Deepings | 1:05.75 |
| 7 | 32 | Lynden HOLTOM-STOTT | 16 | Nuneaton | 1:06.28 |
| 8 | 30 | William BRIGHTY | 15 | Melton M'bry | 1:08.83 |