Indian steel magnate Lakshmi Mittal has donated £2m to the Labour Party, matching the amount given by Lord Sainsbury in the election run-up.
Lakshmi Mittal: Praised Labour
Mr Mittal, worth £14.8bn according to the Sunday Times, praised Labour for boosting prosperity in the UK.
He also backed policies on health, education, skills and technology.
Mr Mittal sparked 2002's Steelgate row when it was revealed Tony Blair backed his bid for a Romanian firm shortly after he donated £125,000 to Labour.
The magnate has always denied any link between the donation and the letter. At the time Downing Street said that the prime minister was just doing what he normally do for any British businessman.
A Labour spokesman confirmed that the £2m was one of the largest ever received by the party.
He said: "We are grateful to everyone who contributes whatever they can to the Labour Party.
"We appreciate this very generous donation and thank Lakshmi Mittal for his continued support."
Mr Mittal is the chairman and chief executive of the Mittal Steel Company - the world's biggest steel firm.