Tory PM David Cameron was accused yesterday of trying to buy the general election by busting spending limits by more than £6 million.

His government has raised the campaign spending ceiling by £6.2 million — double the figure recommended by the Electoral Commission — to £32.7 million.

The changes to election spending law were quietly slipped through Parliament without any scrutiny from MPs or peers.

Labour says it will allow the Tories to take advantage of slush funds set up by secretive backers in the run-up to May’s crucial poll.

“With only a record of failure to run on, David Cameron’s campaign is reliant on smear, fear and fat cats’ cheque books,” said Labour election campaign vice-chairwoman Lucy Powell.

A briefing by the party revealed that Mr Cameron’s re-election campaign was set to receive huge sums from hedge funds, big business and secretive supper clubs.

It explained that the Tories had received £6m from Unincorporated Associations, which does not have to declare all its donations, since the last election.

And they are using the cash to flood marginal seats with leaflets for every voter.

“The Tories want to cut the state back to the level it was in the 1930s and now we know they want to buy an election they don’t deserve to win,” Ms Powell said.

“This is a party flush with big money backers but without the empathy or ideas the country needs.”