A “Robin Hood tax” on transactions between [United Kingdom] banks could raise billions of pounds to fight global poverty, according to 48 British non-profit organizations, including Oxfam and the Trades Union Congress.

The campaign, promoted with a video by “Four Weddings and a Funeral” director Richard Curtis, asks governments to levy an average 0.05 percent tax on financial transactions. It follows UK Prime Minister Gordon Brown’s call for a transaction tax to fund future bank bailouts.