EVENT 125 Boys 12/13 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | George Pearson | 13 | Ox & N Bucks | 1:09.82 |
| 1 | 4 | Oliver Silver | 13 | Notts | 1:07.80 |
| 2 | 6 | Leo Ferguson | 13 | Somerset | 1:07.40 |
| 3 | 8 | Charlie Collins | 13 | Lancashire | 1:06.52 |
| 4 | 10 | Jake Hutchinson | 13 | Shropshire | 1:05.89 |
| 5 | 9 | Davey Unwin | 13 | Cheshire | 1:06.39 |
| 6 | 7 | Nikita Charykin | 13 | Essex | 1:07.32 |
| 7 | 5 | Joshua Williams | 13 | Devon | 1:07.78 |
| 8 | 3 | Tyler Coles | 13 | Northants | 1:08.60 |
| 9 | 1 | Nicholas Skinner | 13 | Derbyshire | 1:11.10 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Toby Clausen | 13 | Yorkshire | 1:04.60 |
| 1 | 14 | William Ellard | 13 | Suffolk | 1:03.99 |
| 2 | 16 | Murray Dickson | 13 | Scot West | 1:03.95 |
| 3 | 18 | Thomas Maskell | 13 | N & Durham | 1:03.52 |
| 4 | 20 | Stefan Krawiec | 13 | Scot East | 57.80 |
| 5 | 19 | Sebastian Major | 13 | Swim Wales E | 1:02.84 |
| 6 | 17 | Edward Whittles | 13 | Middlesex | 1:03.77 |
| 7 | 15 | Zain Lam | 13 | Surrey | 1:03.97 |
| 8 | 13 | Samuel Ryan | 13 | Kent | 1:04.55 |
| 9 | 11 | Ben Phillips | 13 | Berks&SBucks | 1:05.16 |