Well, really the request was tongue and cheek. Someday I will travel to Scotland with one empty suitcase which I will bring back filled with yarn. Or maybe I'll just move there, either Scotland or New Zealand where the sheep outnumber the people.
Until then, colchar, if it says Jamieson's or shetland wool anywhere on the label, you're good. There's a Jamieson's and a Jamieson & Smith's but they both do say Jamieson's on the label. (I'm kidding -- on the square -- cause if you do bring me back some yarn, I will take it.)
Need yarn? Need is a variable term when it comes to knitters and yarn. I probably don't actually need to buy yarn for at least 10 years. That's not going to stop me though.