EVENT 107 Girls 16/17 Yrs 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Emma Leslie | 17 | Cambs | 1:06.87 |
| 1 | 4 | Honor Davies | 16 | Dorset | 1:05.44 |
| 2 | 6 | Hannah Slater | 16 | N & Durham | 1:04.19 |
| 3 | 8 | Lija Radziunaite | 16 | Suffolk | 1:04.10 |
| 4 | 10 | Emily Peck | 17 | Lancashire | 1:03.61 |
| 5 | 9 | Tilly Hansen-Hamilton | 16 | Surrey | 1:03.78 |
| 6 | 7 | Ciara Usher | 16 | Northants | 1:04.15 |
| 7 | 5 | Jasmine Iley | 17 | Essex | 1:04.93 |
| 8 | 3 | Erika Coupek | 16 | Scot East | 1:05.64 |
| 9 | 1 | Charlotte Gudgeon | 17 | Leics | 1:07.72 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Imogen Meers | 16 | Kent | 1:03.54 |
| 1 | 14 | Rachel Anderson | 16 | Somerset | 1:03.16 |
| 2 | 16 | Rebecca Sutton | 17 | Swim Wales E | 1:02.85 |
| 3 | 18 | Lily Boseley | 17 | Yorkshire | 1:01.05 |
| 4 | 20 | Katelyn Bergin | 17 | Devon | 1:00.45 |
| 5 | 19 | Medi Harris | 16 | Swim Wales W | 1:00.87 |
| 6 | 17 | Emilia Sansome | 17 | Berks&SBucks | 1:01.45 |
| 7 | 15 | Ellis Shiels | 16 | Scot West | 1:02.87 |
| 8 | 13 | Emily Ford | 16 | Ox & N Bucks | 1:03.32 |
| 9 | 11 | Brodie Judge | 17 | Middlesex | 1:03.60 |