| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Maia DUNLEAVY | 16 | Chelsea&West | : . |
| 1 | 2 | Poppy RICHARDSON | 16 | Co Peterboro | : . |
| 2 | 3 | Jemima HALL | 16 | Hillingdon | : . |
| 3 | 4 | Brodie JUDGE | 16 | Ealing | : . |
| 4 | 5 | Maisie MACARTNEY | 16 | Thanet Swim | : . |
| 5 | 6 | Francesca WHITING | 15 | Sevenoaks | : . |
| 6 | 7 | Sara KALAWSKA | 14 | Hatfield | : . |
| 7 | 8 | Holly WHITE | 15 | Co Liverpool | : . |
| 8 | 9 | Elizabeth ARNOLD | 16 | Swansea Aq | : . |
| 9 | 10 | Rachel NASH | 13 | Boldmere | : . |