Don't Change Your Scottish Notes Here

On looking at silver coins in the Tavid kiosk in Kristiina Keskus I was a bit surprised to see that, for some reason, a 'Scottish' pound is set at a lower price than an 'English' one, whether buying or selling, to the tune of about a Kroon or so, given that they are actually the same currency.

Now, not being an expert in monetary matters I'm sure there's a legitimate reason, and I can well remember the confusion that Scottish notes that I was given as a kid when visiting relatives (especially if they were issued by the Clydesdale Bank) would bring when trying to persuade hog ignorant anglo saxons that they were legal tender. But at the same time I'd have thought there ought to be some solidarity between one small, formerly oppressed nation and another. Or are Estonian issued Euros going to exchange at a lower rate than Finnish ones from next year?