Indian businessman Prateek Gupta claims Trafigura traders dreamed up a $590m nickel shipping fraud, which is set to end in a huge court battle.

The Financial Times cited UK High Court filings made by Gupta as accusing the trading giant of “devising and proposing” the scheme.

The defence documents allege that certain Trafigura employees suggested trading other materials that would be passed off to the commodity trader’s lender Citibank as more expensive nickel.