//Oh, and for those who suggest the whole of the UK should decide yay or nay on Scottish independence, did they at the time want the whole of the EU to decide for or against Brexit ?//
//Karl, There's no comparison in the relationship between that of Scotland within the UK & that of the UK within the EU.//
Indeed there isn’t. The European Union was a collection of disparate nations which had been forged together under the guise (initially) of forming a trading bloc (very good idea). But it later gained ideas and ambitions way above its station when it tried to morph into a single federal state (very bad idea). There was no single head of state, no single language, no single government, no single economic model and no single currency so that task was also going to be a struggle. It would have been difficult enough with the original six, or maybe then nine that formed the bloc when the UK joined. But at least they had similar economies. The problems with that ambition began when the EU’s expansion took in countries which had vastly different economies. Despite its name, the European Union was no union at all but simply a collection of members. It would make no more sense to allow the people of all those members to vote whether or not one of them should leave than it would to allow all the members of the Marylebone Cricket Club to have a say on whether one of its members should leave.
The Union of Scotland and England, by contrast, was formed of two nations who had shared a monarch for a hundred years and who shared common values and a common language (well, very nearly!). It has also shared a Parliament for 300 years (leaving aside the nonsense implemented by Tony Blair) and is, to all intents and purposes, a single sovereign nation. It would be very reasonable to ask all the people of that Union a question about its future. England has a vested interest in Scotland (and vice versa) because it is part of the nation, just as Cornwall or Yorkshire is.