A strong performance by Farage's party could signal to Scotland that England may vote to leave the EU in a future in/out referendum.
A senior party source rejects Farage's suggestion that Miliband would be forced to guarantee a vote.
But Ukip is betting on a late surge.
The party now favours strict limits on zero-hour contracts, the abolition of the bedroom tax and progressive taxation.
The party's new campaign is designed to win votes by whipping up animosity against foreigners living and working and contributing to this country.
The party attacked "privately educated" Times journalists. But its leader, treasurer, a third of its MEPs and all of its peers were similary well-schooled.
The rise of UKIP and the fall of the Lib Dems explains why Labour is maintaining a lead approaching the final year of this parliament.
Ukip leader boasted of being able to earn as much as a Goldman Sachs banker by claiming expenses and employing his wife.
Ukip denounces "smears" from the Times and claims its leader is "confident that he has abided by European parliamentary rules at all times". But will he offer transparency?
The Prime Minister radiates the Westminster elitism of which Farage offers himself as the scourge.