UK Elections: David Cameron tells voters at polls - 'Don't do something you'll regret'
* Boris Johnson said that the polls are “moving” and that predicted that that the election “could be breaking our way”
* George Osborne, the Chancellor, warned that Britain could be plunged into a French-style economic crisis if Labour takes power with the help of the SNP
* Mr Miliband was accused of running an “antiseptic” election campaign in which he refused to meet ordinary voters
* It emerged that the Liberal Democrats will to force the Tories to water down their plans for £12 billion worth of welfare cuts as their price for a second coalition
* Mr Miliband again refused to rule out attempting to form a government if he does not win the most seats at the election
David Cameron has urged the British public not to "do something you'll regret" as voters head to the polls for the closest general election in a generation.
With the final round of opinion polls showing Labour and the Conservatives neck and neck, the Prime Minister uses a Telegraph interview to urge voters to reflect in the "solemn quiet" of the polling booth before casting their ballot.
Mr Cameron says that the 2015 general election will "define this generation" with major constitutional and economic issues at stake for the country.
The last round of opinion polls and forecasts from bookmakers suggests that the election will lead to a chaotic result - with Labour and the SNP vying with the Conservatives, propped up by the Liberal Democrats, to form the next Government.
Senior Conservatives privately hope that, as in 1992, the opinion polls are not reflective of the nation's mood and that so-called "shy Tories" or people having last-minute doubts over Labour's credibility could yet swing behind Mr Cameron.
On current polling, the Tories are hopeful of winning at least 290 seats – potentially as many as 300. They require at least 323 seats to claim a majority in the House of Commons and would therefore need the support of at least one other party under this scenario.
The bookmakers narrowly predict that Mr Cameron will remain Prime Minister after the election and discreet game-planning for the Coalition negotiations which may start on Friday have already begun.
Speaking on the final day of campaigning, as he made a symbolic visit to Scotland just hours before the polls open, Mr Cameron made a final appeal for potential Ukip voters - seen as a key group who could yet switch and deliver a Conservative win.
The Prime Minister said that a vote for Nigel Farage's party will “endanger the economy and your family’s security” by allowing a “shambolic” government to take power.
"The future of the country is in your hands. Don’t do something you will regret,” Mr Cameron said.
"Think of the future of our country before you vote. We can stay on a strong path of growth, jobs and success - or we can put it at risk with taxing, borrowing and Ed Miliband propped up by the SNP."
Meanwhile, Ed Miliband held his final rally in Leeds, near Nick Clegg’s Sheffield Hallam constituency, which Labour is still hoping to win from the Deputy Prime Minister.
In other developments on the final day of the election campaign:
* Boris Johnson said that the polls are “moving” and that predicted that that the election “could be breaking our way”.
* George Osborne, the Chancellor, warned that Britain could be plunged into a French-style economic crisis if Labour takes power with the help of the SNP.
* Mr Miliband was accused of running an “antiseptic” election campaign in which he refused to meet ordinary voters.
* It emerged that the Liberal Democrats will to force the Tories to water down their plans for £12 billion worth of welfare cuts as their price for a second coalition.
* Mr Miliband again refused to rule out attempting to form a government if he does not win the most seats at the election.
Speaking just hours before the polls opened, Mr Cameron said that “Telegraph readers can help us stop” the “chilling” prospect of a high-taxing, high-borrowing Labour government requiring the support of Nicola Sturgeon and Alex Salmond to pass laws.
He warned that a Labour-led government would mean higher mortgage rates for families and urged people to think of the “consequences" of the UK economy grinding to a halt.
The Labour Party has in recent days intensified its “ground war” in key marginal constituencies, with millions of pounds being spent by the unions to ensure that thousands of activists are encouraging people to get out and vote.
The weather is also expected to play a factor lso expected to play a factor in the final result. With the Met Office predicting sunny conditions, voter turnout could be high, potentially benefiting Mr Miliband.
It emerged on Wednesday that senior aides to Mr Miliband are studying Whitehall rule books in a bid to find a way to oust Mr Cameron by the end of the week if the Conservatives finish as the largest party and declare victory despite not being in a position to command a majority.
Mr Cameron urged voters across the country to think of the “big choice” facing them as they go to the polling stations.
"It's a very big choice," he said. "So I hope people will think of the country and I hope, in the solemn quiet of the polling booth, people who in the past might have voted for Ukip will think, 'This election is so important. I must of think of the future of the country and vote for the team that will keep our country moving, keep our country growing and give us that referendum on Europe that we deserve'.”
Mr Cameron added: “It's not a time to send a message or make a protest or make a statement. This is a choice.
“Don't waste the last five years. We've come such a long way. To go back to the big taxing, big borrowing, big spending would be such a mistake. So I hope they'll think in the solemn quiet of the polling booth about that moment and about that choice and what's best for our country.”
Read more: UK Elections: The three main battlegrounds
Asked if Ukip voters will “regret” supporting Mr Farage’s party, the Prime Minister said: “Yes, because the great irony is that if you vote Ukip in a general election there's a very good chance you get the absolute opposite of what you want.”
Mr Cameron warned that a vote for Ukip will “endanger the economy and your family’s security".
“For many Ukip voters, the argument about the economy is even more significant because all voters care about the future prosperity of the country and their family’s future prospects – and that’s what’s at stake,” he said.
“It’s a combination of – you get the opposite of what you want with Ukip, but you also endanger the economy and your family’s security.”
Asked if voters will feel that Mr Miliband has “stolen the election” if he attempts to take power despite Labour being only the second largest party, Mr Cameron said: “There are real concerns about this. It’s a concern about credibility and the credibility of a government that relies the votes of people that don’t want that government to succeed, that don’t want the country to succeed, that don’t want that country to exist.”
He added: “I do think Ed Miliband is trying to mislead people. He’s making this pledge about no pact and no deal over here, while at the same time absolutely being clear that he’s prepared to be prime minister on the back of SNP votes.”
Mr Cameron also insisted that he would have a democratic mandate to govern in Scotland if he wins the general election with no MPs north of the border.