As I understand it you can't commit high treason against the government, only the Crown.

In Law, treason is the crime that covers some of the more extreme acts against one's Sovereign or Nation. Historically, treason also covered the murder of specific social superiors, such as the murder of a husband by his wife or that of a master by his servant or slave. Treason against the Crown was known as High Treason and treason against a lesser superior was petty treason.  

So it is the case that you cannot commit high treason against the Government MSP, but you can commit treason. In these cases, and only in these cases, I regard the Nation, and the Government as one and the same.