The G20 faces an impossible task in trying to coordinate a framework for financial oversight that can span every member state, according to senior bankers, regulators and policymakers, with national agendas instead likely to come to the fore.

In a two-day summit on regulation hosted by the International Centre for Financial Regulation in Amsterdam, 94% of attendees - which included bankers, regulators, policymakers and politicians - said they feared the G20's objectives would be trumped by national concerns.