someone is going to have to pay for it though.
The 'nation' pays for it, oldgimmer.
The nation is not a business, it doesn't have to make a profit, or even 'balance the books', because it doesn't have to 'earn' aanything. It issues its own money. If it were to fund nursery education the money it puts in will come back to it by way of taxes on the sales (VAT) and profits of the the private companies it buys all its resources from; from furniture and equipment to toilet paper and cleaning materials. Also, income tax from the staff employed by its private suppliers, whose wages come out of the income they make from supplying the government.
Then the same taxes apply to the wages the government pay to their directly employed staff; income tax, taxes on their purchases and taxes on the businesses (and their employees) that they purchase from.
The only money that doesn't come back pretty fast is any savings that people might make. But even that get taxed back once the savings are spent.
So, tell me why our government, which is supposed to run the country so as to benefit all its citizens, couldn't finance universal nursery education?