And the flow of punters' money is showing the Conservatives winning the most seats, but Labour opposition leader Ed Miliband becoming prime minister after the May 7 vote.
With the polls neck-and-neck since parliament was dissolved on March 30, many commentators have branded it a dull contest -- not so bookmakers, with the uncertainty triggering a betting bonanza.
"We wouldn't call it a flat campaign at all: it's the biggest political betting event we've ever seen," said Graeme Sharpe, spokesman for bookmakers William Hill.
Prime Minister David Cameron's Conservative Party is battling it out with Miliband's Labour -- though neither is likely to win a majority of seats, meaning the election outcome is anything but clear.
"The only consensus around this election is that there's going to be a mess," Paddy Power spokesman Rory Scott told AFP.
"A hung parliament is a done deal," he said. The bookmaker is offering odds of 1/8 on it happening.
Those odds mean there is an eight in nine (89 per cent) chance of a hung parliament, and punters would have to gamble 8 pounds to win 1 pound.
One man bet 200,000 pounds on a hung parliament when the price was 2/9 -- the largest general election bet any bookmaker has ever taken, according to Sharpe.
To form a majority government, the two major parties would have to team up in coalition with smaller parties. Bookmakers are offering odds on 32 different possible combinations.
"Spare a thought for the poor civil servants drafting scenarios for each of those situations," said Scott.
"We've termed it the first political Grand National. All in all, it's a remarkable event," Sharpe told AFP.
Voters may tell pollsters one thing but they're much more likely to go with their real feelings when they've got money staked on it -- and that's why election pundits look at the odds as much as the opinion polls.