Tens of millions of pounds more will be wagered thorough spread-betting firms such as Sporting Index and Cantor Sport.

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Since then City Index and, more recently, Financial Spreads, a subsidiary of Sporting Index, have also muscled into finance.

ECONOMIST: A day at the stockmarket

"I guarantee that this will be the biggest betting event that this planet has ever seen, " says Wally Prior of London-based Sporting Index, the leading spread-betting firm.

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