Check out policy EC661 The Green Party believes that, as the means of exchanging goods and services, the stock of money is a vital common resource which should be managed in the public interest. Yet only 3% of our money supply currently exists in the form of notes and coins issued by the Government or the Bank of England. 97% of the money circulating in the economy takes the form of credit that is created electronically by private banks through the accounting processes they follow when they make loans. for an idea of the full extent of tax payer value of such a policy see.
From 2002 to 2009, banks increased the amount of money in the UK by £1 trillion through lending (with every new loan creating new money). Because this money was created by banks, it’s the banks that get the benefit from it (in this case, the interest received on £1 trillion of additional loans).
If the government had created this money instead of the banks, taxpayers would have been able to pay up to £1 trillion less taxes: approximately £33,000 for every person who pays income tax over just 7 years.