EVENT 107 Girls 16/17 Yrs 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Jasmine Iley | 16 | Essex | 1:06.05 |
| 1 | 4 | Caitlin Duffy | 17 | Scot West | 1:05.40 |
| 2 | 6 | Charlotte James | 17 | Dorset | 1:05.00 |
| 3 | 8 | Hannah Sloan | 17 | Swim Wales E | 1:04.54 |
| 4 | 10 | Sam Girle | 17 | Hampshire | 1:04.31 |
| 5 | 9 | Brodie Judge | 16 | Middlesex | 1:04.40 |
| 6 | 7 | Katie Henderson | 17 | Notts | 1:04.70 |
| 7 | 5 | Sophie Maguire | 16 | Sussex | 1:05.00 |
| 8 | 3 | Jessica Damen | 17 | Scot East | 1:05.76 |
| 9 | 1 | Lauren Watt | 16 | Suffolk | 1:07.38 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Emma Harvey | 16 | Somerset | 1:03.00 |
| 1 | 14 | DAISY PLATTS | 17 | Leics | 1:02.59 |
| 2 | 16 | Jane Brown | 17 | N & Durham | 1:01.31 |
| 3 | 18 | Lily Boseley | 16 | Yorkshire | 59.94 |
| 4 | 20 | Anna Maine | 17 | Surrey | 59.40 |
| 5 | 19 | Katelyn Bergin | 16 | Cheshire | 59.81 |
| 6 | 17 | Tegan Drew | 17 | Devon | 1:01.27 |
| 7 | 15 | Lucy Farmer | 17 | Ox & N Bucks | 1:02.19 |
| 8 | 13 | Emily Peck | 16 | Lancashire | 1:02.70 |
| 9 | 11 | Robyn Moon | 16 | Kent | 1:04.10 |