The point that the anti-austerity campaigners keep missing is that government spending over the past 5 years has gone UP.
The SNP are advocating a policy that the present government has been following anyway.
The issue for the Tories / Lab / Libs is that, for the sake of the markets, they have to give out the impression of fiscal responsibility.
But in reality, government spending will continue to increase over the next 5 years regardless of who wins power, just has it done over the past 5 years and just as the SNP are advocating.
That is why the Tories / Lib / Lab won’t / can’t give any details on where they will make cuts… because they have no intention of cutting government spending.