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Hedge fund manager Anthony Ward has cornered a large piece of the world's cocoa market after buying 240,000 tonnes of cocoa beans, reports suggest.

The £650m ($992m) investment buys Mr Ward enough cocoa to make more than five billion small chocolate bars, the reports say.

The investment was reportedly made by Mr Ward's hedge fund Armajaro, which would not confirm or deny the reports.

The price of cocoa has risen sharply in recent years due to increased demand.

The deal is the single largest cocoa trade in 14 years, the reports suggest.

Unusually, it is thought the firm will take delivery of the cocoa beans and is likely to store them in warehouses in England and the Netherlands.

Chris Skinner, chairman of the Financial Services Club said this represented "the whole of Europe's cocoa" - enough to fill "five Titanics".

He said the price of cocoa had risen by about 16% in the past year because production of the beans had decreased in Africa.

He told the Today programme: "I guess Mr Ward's thinking, 'Well, I'd bet on the fact that, in the future, if I get control of the whole supply of cocoa, then I can corner the market and make a bit more money out of this.' He's done it before, in 2002, so he's trying to do it again.

"It's a bit like the film, Trading Places, with Eddie Murphy, with the pork bellies. If you control that supply and hold on to it and you squeeze the market, you see the price going up and at some point you release those supplies and then you make a mint."

"You can speculate on the futures market on any commodity - from corn and wheat to oil and gold."

Anti-poverty group the World Development Movement is calling for limits to be introduced to stop speculators influencing the market in coffee, cocoa and wheat.

The author of its report, Tim Jones, told Today Mr Ward's cocoa investment represented the type of market speculation his group wanted to see curbed.

He said: "The fact that he's taken delivery is something more unusual, but we see this speculation all the time in food markets, in coffee, in wheat, and this has real impacts on people across the world.

"To have speculators pushing up prices, causing changes, causes big problems for farmers and increases poverty. In 2008 it was one of the reasons why hundreds of millions more people were pushed into hunger."

Mr Jones said artificially high prices could lead farmers to grow the wrong crops, only to make a loss when withheld supplies were released to the market causing prices to fall.

The World Development Movement wants the UK and EU to follow the example being set by the US and introduce limits on the amount of money speculators can put into markets to protect them from being swamped by "hot money".

Mr Ward co-founded Armajaro in 1998 and is ex-chairman of the European Cocoa Association.