EVENT 122 Girls 16/17 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Zoe Price | 16 | N & Durham | 1:17.09 |
| 1 | 4 | Emily Surminski | 16 | Middlesex | 1:14.27 |
| 2 | 6 | Vejune Petraityte | 16 | Essex | 1:13.82 |
| 3 | 8 | Hannah Sheehan | 17 | Lancashire | 1:13.01 |
| 4 | 10 | Chloe Eastwood | 16 | Kent | 1:12.88 |
| 5 | 9 | Bridget Lemasurier | 16 | Scot East | 1:12.96 |
| 6 | 7 | Cerian Harries | 16 | Swim Wales W | 1:13.21 |
| 7 | 5 | Mair McRae | 16 | Swim Wales E | 1:13.90 |
| 8 | 3 | Lucy Moores | 17 | Surrey | 1:15.76 |
| 9 | 1 | Mia Larke | 17 | Leics | 1:17.39 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Lauren Watt | 17 | Suffolk | 1:12.26 |
| 1 | 14 | Hollie Steer | 16 | Devon | 1:11.22 |
| 2 | 16 | Aiyana Lawson | 17 | Ox & N Bucks | 1:10.37 |
| 3 | 18 | Kayla Van Der Merwe | 16 | Dorset | 1:09.48 |
| 4 | 20 | Katie Robertson | 17 | Scot West | 1:07.68 |
| 5 | 19 | Rebecca Clynes | 16 | Yorkshire | 1:09.45 |
| 6 | 17 | Ailsa McDonald | 17 | Northants | 1:10.27 |
| 7 | 15 | Lily Booker | 17 | Somerset | 1:10.93 |
| 8 | 13 | Daria Poma Kostik | 17 | Berks&SBucks | 1:12.09 |
| 9 | 11 | Amelia Monaghan | 16 | Cambs | 1:12.52 |