Guest, it's not the English flag that song refers to but the British one. Scotland profited from the British Empire just as much, perhaps more, than other parts of Britain, and to this day Scottish engineering can be found in the remotest corners of the globe. Scots were at the forefront of developing and ruling the Empire. So don't try to claim some kind of moral superiority for Scotland, you were as culpable as we were for its excesses and mistakes.