Ed Miliband is set to visit Scotland for the first time in his election campaign, where he will claim SNP policy would cause a £7.6bn black hole.

Sharing a platform with Scottish Labour leader Jim Murphy and Ed Balls, he will attack SNP plans for full fiscal autonomy for Scotland.

Labour are under pressure north of the border thanks to growing support for the SNP, which could cost them dozens of seats and even deprive them of a majority.

Mr Miliband will say: "Full fiscal autonomy will mean a £7.6bn hole in Scotland's finances. A £7.6bn gap that would need to be filled with more taxes on working people or more borrowing.

"You can't build social justice with a £7.6bn funding gap because the burdens of it would fall on working families across Scotland."

Mr Murphy has previously been careful to put distance between himself and Labour's Westminster leadership, saying: "I'm my own man".

It will be the first time the two men have shared a platform since the start of the campaign.

Labour sources say the joint news conference is in response to the leader of the SNP calling for more powers for Scotland in a televised debate with Scottish party leaders.

SNP leader Nicola Sturgeon said she would attempt full fiscal autonomy for Scotland within a year, despite opposition warnings that it would leave an immediate £7.6bn hole in Scotland's economy.

Mr Miliband will also criticise SNP calls to scrap the Barnett Formula, which redistributes money raised through taxes around the UK.

He will say: "It means the end to pooling and sharing across the UK.

"It means the benefits of Labour policies, like the mansion tax for the NHS and the bank bonus tax to pay for jobs for our young people won't be felt in Scotland.

"This strikes to the very heart of what I believe in.

"I will never sell Scotland short by signing up to the SNP's plans."