SPENDING pledges by the UK's two biggest parties are not deliverable, according to the Institute for Fiscal Studies.

Director Paul Johnson, speaking at the Fraser of Allander Institute's launch of the annual Scotland's Budget Report, said some of their announcements are "campaign rhetoric" .

He said: "In September in the spending round, the Conservatives promised some fairly significant increases in spending next year, particularly in health, education and social care.

"Obviously not undoing the cuts across the piste in the last decade or so. They're just about consistent with keeping the public finances under control.

"We've got Labour and the Conservatives proposing significant spending increases, they're just not deliverable.

"You can't double investment spending within three or four years in any sensible way.

"We wait to see what their broader spending plans are going to be."

The economist also said the announcements made to date, in the run-up to the December 12 poll, are not over and more are likely to be made in the next six weeks.

He said: "We saw in the 2017 Labour manifesto some really big spending increases but they're clearly not mentioning increases in health and welfare, and other things.

"They're really wrapping things up as big shiny things – free education and free childcare.

"One needs to be very careful, because all the things that they're mentioning aren't necessarily all the things.

"(Labour) also have some big tax rises as well, the Conservatives are in a bit of corner because they've said they want to keep the current budget balance, I doubt that they're going to have big tax rises, so that doesn't leave them with room to manoeuvre."

When asked if he thinks some of the spending pledges were "campaign rhetoric", Johnson said: "I think there's a lot of that already.

"The Conservatives have suggested that Labour have £1 trillion in spending pledges, that's clearly not the right number but it reflects all sorts of promises or suggestions or indications that Labour have made of things they'd like to do.

"Of course, the Conservatives are doing the same thing, just like they did at the last election about more GPs and more GP appointments, which sound good – but where's the money coming from?"