SCOTTISH Greens demanded today that the SNP government impose a “mansion tax” if it wants the party to support Scotland’s December Budget.

The SNP has long relied on Scottish Green aid to pass its Budgets at Holyrood, either through abstention or support.

But after the acrimonious breakown of the parties’ formal coalition earlier this year, the prospect of a Budget not being passed and an early election being called is focusing minds.