| B Final | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Meghan Byrne | 18 | Barnet Copt | 4:54.28 |
| 1 | 2 | Rachel Anderson | 16 | Millfield | 4:52.25 |
| 2 | 3 | Charlotte Robinson | 15 | Co Leeds | 4:50.99 |
| 3 | 4 | Mollie Wright | 20 | Nova Cent'n | 4:50.28 |
| 4 | 5 | Sophia Wilson | 17 | Millfield | 4:49.75 |
| 5 | 6 | Freya Colbert | 14 | Nova Cent'n | 4:50.13 |
| 6 | 7 | Beatrice Varley | 15 | Hamilton UAE | 4:50.64 |
| 7 | 8 | Melanie Hall | 19 | Co Sheffield | 4:51.65 |
| 8 | 9 | Olivia Clare | 15 | Co Manch Aq | 4:53.20 |