One key finding was that the new 30 hours scheme could widen the gap between disadvantaged children and those able to take advantage of the increased funding. The report says "neither the tax-free childcare scheme nor the 30 hour entitlement for working families are well-designed to promote social mobility, meaning longer hours in state-funded early education for children who are already relatively advantaged, which may be expected to widen gaps in child development at school starting age. Particularly worrying, these investments are coming at the expense of the quality of provision." You can read the report in full here.