The point is that Westminster simply realised it had no option other than transfer the authority to the Scottish gvt.As the other post re the EU also states the idea of parliamentary sovereignty is not accepted as fact in the Scottish Courts anyway where the Scottish tradition of the sovereignty of the Scottish people comes in to the debate. Only a minority of Scots are against ever having another referendum (though they are very vocal) and should a Scottish gvt be in a position where it is holding one then the UK gvt, following the existing precedent, would have no real option other than to agree to it again. Despite Cameron's ramblings Ruth Davidson conceded last night, even though she rallies against the thought of having one, that the Conservatives would not attempt to block another referendum. That is democracy!

Let's face it there are legalities and there are realities! The legality is that the UK gvt could wind up the Scottish parliament tomorrow and make Nicola Sturgeon's post along with all the other MSPs redundant thus making sure there was no parliamentary route to independence. The reality is that they could never actually force that legality. It simply wouldn't be politically acceptable and neither would blocking a referendum in a part of the UK where there is a clear political mandate to hold it. The precedents were set with the acceptance first that Northern Ireland can leave whenever it wants and then that Scotland was free to choose too. What don't you like about your own countrymen having a democratic choice?