Leading banks from Britain, France and Japan helped investors treble or quadruple bets on Bernard Madoff by lending billions of dollars to “feeder” funds, which placed their money with the alleged fraudster.

HSBC, Royal Bank of Scotland, Nomura and BNP Paribas lent the money without spotting a fraud, and in at least one case without due diligence teams visiting Mr Madoff’s brokerage, which held the assets.