BRITAIN is at risk of "juddering to a halt" if the General Election result ends in deadlock, David Cameron has warned.

With just seven days to go to polling day, the Prime Minister claimed the country was lucky in 2010 because it was possible to put together a strong coalition government relatively quickly.

Appealing to voters to support the Tories as the only party capable of forming a majority government, he noted: "But there's absolutely no guarantee that can happen again with all the uncertainties and instabilities of what's happening in Scotland."

In contrast, Ed Miliband issued a warning to anti-Tory Scottish voters that backing the SNP was a risky "gamble" that could keep Mr Cameron's Conservatives in power.

"For those people who want to get rid of the Conservatives, there's only one way of getting rid of the Conservatives and that is voting Labour; anything else is a gamble and we are going to keep prosecuting that argument," stressed the Labour leader.

Today, Mr Milliband revealed Labour activists and volunteers had since January 1 passed the four million mark for doorstep conversations with voters, a figure he described as "unprecedented" for any political party. The Labour leader issued a new challenge: to have one million more conversations before polling day.

In a campaign message, he will say: "There are just seven days to go before you get the chance to change how our country is run. Seven days to take your chance to make Britain run for working people once again. Seven days to put your family first.

"It is a chance you don't often get; a chance that only comes every five years. And this is the closest general election anyone can remember."

The Labour leader will insist the election was "Britain's big chance to make a big choice" between putting working families first or putting the wealthy elite first.

"The truth is," he will argue, "your families can't afford five more years of putting the wealthiest first. Your NHS can't afford five more years of extreme spending cuts. And Britain can't afford five more years of wasted talent and ruined futures."

Mr Miliband will claim that Mr Cameron wants to distract voters by "banging on about deals with other parties after the election because he has nothing to say about the real issues in this election: the NHS, immigration, family living standards, and the future of our children".

He will add: "I tell you the deal I will make; I will make a deal with the working people of Britain in every part of Britain."