Guvnor - I was under the impression that Scotland was still part of the United Kingdom which is also known as Great Britain. Therefore British Airways is the national airline of Scotland as well as England, Wales and Northern Ireland.
I'm certain you will find (using your stunning inside contacts) that it is not economically viable to fly frequent scheduled long haul wide bodies from Scottish airports. If it was then some smart marketing type would already be doing it. BA don't make people fly to the South because of the prestige of flying from LHR - they do it because it makes more money. An airline is a registered company, not a registered charity - they have a responsibility to their shareholders and employees to act as an on-going concern and not as a vehicle for flights of fancy.