Would this be a "domino effect" thingee? First Scotland, then Wales, then N.I.? Or would Scotland claim stewardship over N.I. ?

How do the Royals figure into this equation? Isn't it a "unified" crown? Or was that just a parliament-passed law?

To follow Sasaki Kojiro's idea: which of the four (Eng, Scot, Wales, NI) has more oil?