EVENT 122 Female 16/17 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Freya Howie | 16 | Wiltshire | 1:19.67 |
| 2 | 3 | Tilly McHugh | 17 | Dorset | 1:17.54 |
| 3 | 5 | Emily Johnson | 17 | Gloucs | 1:16.83 |
| 4 | 7 | Isla MacDonald | 17 | Scot North | 1:15.25 |
| 5 | 6 | Kate Mugleston | 17 | Cornwall | 1:15.50 |
| 6 | 4 | Grace Wingham | 16 | Northants | 1:16.91 |
| 7 | 2 | Imola Jozsa | 17 | Bedfordshire | 1:18.46 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Ellie Wilson | 16 | Cumbria | 1:14.44 |
| 1 | 11 | Daisy Mixer | 17 | Norfolk | 1:13.53 |
| 2 | 13 | Anna Farr | 16 | Shropshire | 1:12.47 |
| 3 | 15 | Danielle Siong | 16 | Ox & N Bucks | 1:12.37 |
| 4 | 17 | Ella Bissicks | 16 | SW Wales | 1:11.26 |
| 5 | 16 | Amber Valletta | 16 | Staffs | 1:11.28 |
| 6 | 14 | Matilda Ransome | 17 | Cambs | 1:12.40 |
| 7 | 12 | Katie Founds | 17 | Lincolnshire | 1:13.05 |
| 8 | 10 | Foteini Kalkani | 17 | Leics | 1:14.40 |
| 9 | 8 | Lois Inch | 16 | Cheshire | 1:14.58 |