I have a law degree and constitutional law was one of my favourite subjects as we have no written constitution in the UK, so is very common law case by case analysis.
I think that the Scottish and Welsh Government overestimates the powers provided by devolution.
This was best demonstrated by the spectacle of Sturgeon (after the Brexit vote) jumping on a plane to Brussels, to negotiate a separate deal with the EU.
To be told upon arrival , that Scotland does qualify as a Country or a nation state and could therefore not be accepted as a member of the EU by itself.
what beggars belief about this was she either did not accept or did not take legal advice on the matter.
The devolved governments are more similar to a province such as Canada, or a State as in the USA, but that does not really work well because England is not classed as a province and has no devolved powers. I prefer a super regional local government authority model.
Granted i am ignoring the evolvement of Scottish law which is different to UK law in some respects and was i believe protected in the Act of Union.
In reality the Uk parliament could at any time revoke all powers devolved to our nations, which i would not support.
i guess my point is that the Scottish Government has gotten to big for their boots.