EVENT 123 Open/Male 16/17 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Alfie Berry | 16 | Shropshire | 1:15.52 |
| 2 | 3 | Max Thomas | 17 | Bedfordshire | 1:13.18 |
| 3 | 5 | Oliver Oxley | 17 | Leics | 1:09.96 |
| 4 | 7 | Logan Mulhall-Reid | 17 | Cheshire | 1:07.73 |
| 5 | 6 | James Escolme | 17 | Cumbria | 1:08.06 |
| 6 | 4 | Joseph Parnell | 16 | Lincolnshire | 1:12.23 |
| 7 | 2 | Huw Cressey-Rodgers | 16 | SW Wales | 1:13.74 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Finley Wonnacott | 17 | Cornwall | 1:07.22 |
| 1 | 11 | Max Wainwright | 17 | Staffs | 1:06.92 |
| 2 | 13 | Edward Ormsby | 16 | Cambs | 1:06.88 |
| 3 | 15 | Freddie Carter | 17 | Wiltshire | 1:06.16 |
| 4 | 17 | Kayden Sillah | 17 | Ox & N Bucks | 1:04.64 |
| 5 | 16 | Rhys Dodd | 16 | Gloucs | 1:05.56 |
| 6 | 14 | Ben Buckley | 16 | Norfolk | 1:06.64 |
| 7 | 12 | James Annable | 17 | Northants | 1:06.92 |
| 8 | 10 | Frederick Beasley | 16 | Dorset | 1:07.02 |
| 9 | 8 | Jack Mitchell | 17 | Scot North | 1:07.30 |