not sure where you get your thousand years.
james vi was a scottish king who was accepted as the monarch of england and wales by right of succession at the beginning of the seventeenth century. and then we had the acts of union a hundred years later. the scottish parliament approved their own act of union without duress.
that's where we all joined up. there's no english yoke although clearly the history of english-scottish relations wasn't always peaceful when scotland and england were independent. i daresay the scots will resent their southern sassenach neighbour regardless of whether we are married or divorced.
the desire to secede is by no means an obvious majority view. but if it achieves a majority, good luck to scotland forging its own pathway forwards. i hope whatever it chooses works out.