Give PhD students full government funded childcare hours

Post-graduate research students fall between the gaps for pre-school age funded hours for nursery places.
With nursery fees at an all time high, even with the funded hours, it leaves many PhD students with young children unable to afford to continue their studies.
Currently, the funded hours are tied to "working hours" (I.e. taxable hours). A majority of PhD stipends are untaxed, and therefore ineligible. Countless brilliant minds have therefore had to leave research in order to "afford" childcare.