Britain votes tomorrow (Thursday) in one of the closest, most unpredictable general elections in decades.
Polling suggests neither Prime Minister David Cameron's Conservative Party, nor Ed Miliband's opposition Labour can win a parliamentary majority.
So the UK could be set for complicated coalition negotiations - or even worse…
Olly Barratt reports from London.
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David Cameron knows time could be running out on his premiership - and if so probably his party leadership.
He is furiously campaigning now in important, marginal seats.
CLIP: "In the closing hours of this campaign you can make all the difference, with our country moving forward, not going backward with Ed Miliband and SNP. That's what it is about!"
The Conservatives claim Ed Miliband will need Scottish nationalists the SNP to form a workable coalition.
He insists his Labour Party will not go into government with the SNP and is working for a majority.
CLIP: "Let's elect a Labour government and make this country work for working people. Thank you very much!"
But with Nicola Sturgeon's SNP set to take dozens of Scotland's westminster seats from Labour - Ed Miliband may need her MPs who want to break up the UK.
So Liberal Democrat leader Nick Clegg - currently deputy prime minister in a coalition with the conservatives - wants people to vote for him to head off involvemnt from anti-immigration, anti-EU UKIP, or scottish nationalists the SNP and their westminster leader alex salmond.
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It's just possible either Mr Miliband or Mr Cameron may try a minority government - without coalition support from other parties.
But if a Prime Minister attempts to govern without a parliamentary majority he will be accused by his opponents of 'squatting' at Downing Street, and lacking a full democratic mandate.
It would also mean difficulty getting legislation through and raise the prospect of another election as early as this year.
It would be an election almost no one wants according to Tony Travers of the London School of Economics.
"British voters don't like to be asked to vote too often - they like to vote, they like to live in a democracy, but they don't like to vote unnecessarily, and so parties will be aware of all these things and try to avoid the instability that, possibly, the result will lead to."
But if no one can win enough seats to form a majority - and minority government becomes the only option available - another 2015 general election may be on the cards.
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