The Con-Dem coalition’s collapse quickened yesterday when Tory PM David Cameron accused his Lib Dem partners of “being all over the place” economically.

In an email to Tory MPs that was leaked to the press, Mr Cameron said the party was “unable to decide” whether it believed in austerity or not.

The PM also made a provocative comparison between his coalition partners and Ukip, saying that both were prepared to “prop up a failing Labour government.”

His attack came in response to the Liberal Democrats’ attempt to pull themselves out of the toxic mire of the Tory-led coalition.

On Sunday, unpopular party leader Nick Clegg attacked Chancellor George Osborne’s plans to slash public spending by £30 billion, after refusing to attend Parliament for the Autumn Statement.

And the Chancellor’s Lib Dem helper Danny Alexander yesterday weighed in on the spat.

Writing in the Daily Telegraph, he accused the Tories of “pandering to Ukip” in a pre-election “panic.”

“It is sad to see the Conservatives move away from the sensible, balanced approach of the coalition, to a more doctrinaire policy that would inflict unnecessary pain on the people of Britain,” he wrote.

But a Labour spokesman said: “The Lib Dems are trying to take people for fools. The truth is their record is the same as the Tory record — failure and broken promises.

“They both promised living standards would rise but, while millionaires were given a huge tax cut, working people are now £1,600 a year worse off.

“You can’t believe a word they say.”