- 5 updates
Nick Clegg predicted that the UK will face another General Election before Christmas if the Liberal Democrats do not form part of a coalition government following this week's poll.
The Lib Dem leader said it would be impossible for a minority government to pass key legislation without signing off controversial concessions to the SNP and Ukip.
A party statement said a second election in 2015 would be "almost inevitable" without the Lib Dems in parliament.
The Liberal Democrats will work with the party with the biggest mandate in the event of a hung parliament, Nick Clegg has said.
However, Mr Clegg did not specify whether this meant the party with the most number of seats or the largest share of the votes.
Asked whether he preferred to work with Labour or the Tories, Mr Clegg told BBC Radio 4: "The party which gets the biggest mandate...[it] seems to me right to give them the space and time to try and form a government."
He accused David Cameron and Nick Clegg of "preposterously charging around the country saying they're going to win an outright majority", adding that the Lib Dems want a "stable, decent and united government" after Thursday's vote.
Nick Clegg said his "epic journey" across the UK shows how much he "cares" about the country.
As he embarks on a 1,000-mile trip ahead of Thursday's election, the Liberal Democrat leader said: "It's just an illustration of how much I care for our wonderful country and want to communicate to as many people as I can that we need to remain stable and decent and united as a country, not lurch this way or that."
Amid mounting speculation about potential post-election deals, Mr Clegg insisted he had not engaged in talks with either the Conservatives or Labour, saying he was waiting for the "judgement of the British people".
Mr Clegg was boosted by a poll last night which suggested he was on course to retain his Sheffield Hallam seat despite a strong effort by Labour.
The Liberal Democrat leader has said his party will not enter into coalition government again "unless we get an approach to balance the books and do so fairly".
Nick Clegg, who was speaking at Land's End as he began a tour to John O'Groats, said: "For instance that means not asking millions of public sector workers to have any more cuts to their take home pay."
Nick Clegg is embarking on a Land's End to John O'Groats campaign marathon in a last ditch effort to save as many Liberal Democrat seats as possible at the General Election.
In a final push aimed at defying national opinion polls which suggest his party could suffer a mauling at the hands of the electorate on Thursday, Mr Clegg will take his battle bus on a 1,000 mile journey across Britain.
ITV News' Emily Morgan is travelling with the Liberal Democrat leader: