As a second point, (and I know this will come off as trying to be controversial, but I don't intend it that way) is there anything, other than what the people at Downing Street and Westminster feel, that says they are obligated to let people in Scotland vote or have a say? Anything they have done in that regard is simply their "generosity and magnanimity, no?
This conversation is interesting, but I fear that the Obamadork, his West Wing Clown Show of Felon/Cretins, and the “Just-Us” dept headed by Mr Quota baby himself would love to render our Constitution irrelevant...and are doing a pretty good job thus far. Methinks the UK populace will come to the correct conclusions (and actions) sooner than we will.
Well, we do have the House of Lords and redress to the British courts. And to the European courts. And the monarch can refuse to pass an unjust law. All laws must have Royal Assent.
Parliament is not the final say, there are redresses. We are not as beholden to Parliament as you think. And of course Parliament is there to represent the people for a start. It is not a dictatorial star chamber.
As to Scotland, and voting in general, I/we/they are obligated/give the right to vote by various laws and ratified political agreements. The 1983 ‘Representation of the People Act’ is the basis for my protected right to vote. Again, its not a case of being given, ‘they’ are obligated by law to allow the electorate the right and opportunity to vote.