THE SNP have hit out at an academic who advised the Better Together campaign for his "hyperbolic attack" on the economic case for independence.

Professor Jim Gallagher, the former director-general for devolution from 2007 to 2010, claimed Scotland faces a “staggering” and worsening deficit: about four times as large proportionately than the UK as a whole.

Ahead of this week’s release of the Government Expenditure and Revenue Scotland (GERS) data, Gallagher has produced an analysis using figures from the Scottish Government’s fiscal commission and statistics published quarterly by Nicola Sturgeon’s administration and HM Revenue and Custom.

Writing in the Sunday Times, he said: “Scotland starts, structurally, from a weaker place [than England]. Its deficit will be even more staggering, probably well over 25% of gross domestic product,” says Gallagher.

“That’s like borrowing the whole budget of the Scottish parliament in one year. No small country on its own could sustain that,” he writes.

"For the SNP in 2014, oil was to save the day. More recently, the party’s fiscal commission planned to keep on borrowing until something turned up. These are just different fiscal fantasies, denying the reality: independence would carry a painful price in jobs and public services."

Gallagher, who advised Better Together in 2014, adds that Scotland is among the worst countries affected by coronavirus in terms of its national economy, the number of deaths and the depth of the recession.

A spokewoman for Scottish Finance Secretary, Kate Forbes, condemned Gallagher's comments, saying the Scottish Government does not have the financial powers to stop the economic impact of the pandemic.

She added: “It is the case for the union which is sinking fast, and desperate, hyperbolic attacks like this are one of the reasons why.

“Every single country on earth is being impacted economically by the pandemic. The difference for Scotland is not, as Mr Gallagher implies, that we are uniquely incapable of tackling it but because, unlike most countries large and small, we don’t have the full economic powers to do so.”