The SNP are claiming they can ‘block Labour budgets’, ‘end austerity’ and ‘stop Trident’. Their problem however is simple – most of what they say is based on assuming that Westminster works the same way as Holyrood does for budgeting – and it doesn’t. There are huge ‘constitutional’ and practical obstacles to implementing the sort of radical challenges to Government tax and spend decisions that the SNP and others seem to be mooting. The first set of problems is that in the Westminster parliament only the Government can propose taxation or spending measures. These can be defeated, or amended, but only by cutting spending or lowering or removing taxes – not by increasing either.
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