Labour leader Ed Miliband launches his party's Manifesto for Young People at Bishop Grosseteste University, in Lincoln, in eastern England on Friday, ahead of a general election on May 7. 

AFP/London

British bookmakers were offering on Friday their shortest-ever odds on a hung parliament in next month's general election, with David Cameron's survival as prime minister too close to call.

Cameron's Conservatives are the clear favourites to win more seats than any other party in the May 7 vote, but betting firms predict that will not be enough to keep him in office.

Indeed, bookmakers reckon a minority government of the current main opposition Labour Party, led by Ed Miliband, is the most likely outcome.

Betting chain William Hill now have a hung parliament at odds of 1/8, meaning they reckon there's an eight in nine chance that it will happen.

Bookmakers have Cameron's centre-right Tories as odds-on to win the most seats, meaning it is considered more likely to happen than not. Ladbrokes have them at 1/2 and centre-left Labour at 13/8.

However, when it comes to forming a government, they reckon a Labour minority administration - backed up by smaller, left-wing parties - is the most likely election outcome.

If no single party wins a majority, it is not necessarily the party with the most seats which gets to form the next government.

Labour could win fewer seats than the Tories and still take power if it can secure the backing of other, smaller parties to boost its numbers and create a parliamentary majority.

"The main market people are betting on is for the most seats and most votes. At the moment the Tories are odds-on in both of those," Ladbrokes spokeswoman Jessica Bridge said.

"The post-election government is where it gets very, very messy."

Paddy Power have a Labour minority at 13/8, then a Conservative minority at 5/2 and a Conservative majority at 6/1, the same as a second Conservative-Liberal Democrat coalition. A Labour-Liberal coalition is 8/1, then a Labour majority 16/1.

A Conservative-Labour coalition is 25/1, very much an outside chance.

Bridge said: "Labour are ever so slightly favourites for a minority government because when you look at who the Tories and Labour can buddy up with... Labour can obviously turn to the SNP (Scottish National Party) very easily."

So with the polls neck and neck, Miliband is considered as likely as Cameron to secure Downing Street.

"The good news for Mr Miliband is that for the first time Hills have him as 10/11 joint-favourite, along with David Cameron, in their market on who will become prime minister," said William Hill spokesman Graeme Sharpe.

"The bad is that Hills offer 4/7 that he will no longer be Labour leader on January 1, 2016 - 5/4 that he is."

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