Identity differences are often fossilized by the legacy of ancient grievances, as people nurture historical memories of past hurts and lay blame on their enemies, thinking themselves the wronged goodies. Let's be clear, in the bloodstained history of England and Scotland there have been few, if any goodies. Both sides have invaded each other's countries, massacred each other's armies, slaughtered, plundered, tortured and enslaved. Both nations are as guilty as hell! And I make no excuses for my fellow English.
The misbehaviour of the English in Scotland is a matter of historical record. The Plantagenet king Edward the First, vicious thug, did much to harm Scots, and his atrocities in Berwick upon Tweed would now have been war crimes. His brutal treatment of the Scottish hero, Wallace, was an atrocity.
Henry the Eighth also committed atrocities in Southern Scotland. What is known as the Rough Wooing, when Henry tried to force the Scottish king to wed his daughter Mary, later to be queen of Scots, to his son Edward was the source of much violence and injustice. Henry also launched an unprovoked invasion of Scotland that resulted in the English victory of Solway Moss, though the result was politically indecisive. It is worth saying that Henry killed more of his own English people than he did Scots.
Yet before we start playing goodies and baddles we must recall that during the Norman period there were major Scottish raids on England in which thousands of Northern English were either massacred, robbed or taken as slaves. In 1069 the population of Durham was cowering in Durham Cathedral from an attacking Scottish horde until the Normans arrived to defeat them.
In the time of the Baronial Wars the Scottish king David, who held earldoms in Northern England tried to unite them into Scotland by invading, taking advantage of England's civil war, only to be defeated at the battle of Northallerton  after which the Scots were harried back to the border by vengeful English.
Scots were not subjects of the British empire. As much as the English they profited from it. Both English and Scots managed colonies and exploited the economic opportunities that empire brings. Both filled the ranks of the force of empire. Both Scots and English profited from the slave trade.
Much injustice in Scotland was done in the Highland Clearances, in which Scots were unjustly driven from their lands, often into emigration to make way for sheep. But it was Scottish landlords who were meeting demand for wool from English merchants, so there were morally guilty people in both countries, and this is more of a class than a nationality issue.The clan wars that beset Scotland were Scots fighting Scots, and the English had little to do with them.
It would be a good idea if some people who nurture historical grievances about each other's country grew up and realized that historic animosities must be put behind us. Our national identities are born of bloodshed, but bloodshed should not have the last word on them. We need to move on into a peaceful, shared tomorrow.