My older child is now 3 and since I have no clue about the school system in England maybe I can get help here...
Currently the child is in the preschool in a nursery. My employer kindly pays part of the fees. They will also give me a contribution towards (private)school fees, but only once he*s turned 5.
We put him on the waiting list of a good school nearby, but I am not sure if I can leave him in nursery until year one starts.