They already do print their own quids, three different sets of their own quids, Bos, RBS and Clydesdale
Personally I think all 16-17 years should get the vote UK wide but thats a different topic altogether
yes, they do print their own quids, but they are worth a pound and directly interchangable. What they have is UK money with their own picture on it. That becomes tricky if they are independent. We can't have a shared currency where two separate countries can decide whether to print more and more money. Once we are separate they would have to decide to keep adherence to the UK pound and thrive or die by its performance (and therefore their own fate is still utterly out of their hands). Or they keep the right to print money and influence exchange rates, by having their own currency. Once they have their own money (beyond just having their own pictures on UK money), they are at the mercy of the markets. Now that might turn them into Switzerland, or it might turn them into Hungary.