Has the UK Treasury ever "projected" an accurate figure about anything? It might help if you also read the information provided by Scottish ministers. For example, where did the Treasury get the figure of 180 departments, as it appears to be based on nothing ever decided by them?
Just another "scare story" in a long flood of such tales, designed to persuade Scots that they'd better go on clinging to nanny's skirts! By 'nanny' I mean the UK as a whole - of which Scotland itself is a part - not just England.