I'm a little late to this conversation but here goes. Spent almost 3 weeks in Scotland last October. A good friend who had just been there encouraged me to take my beloved, broken-in, Redback ankle boots that look like Blundstones . These are probably 10 - 12 years old. I polished them up and wore them every single day. When it rained, or we were walking on rough road, or in cities - they were great because I'd already walked miles in them and my feet love them. Really, nobody in Scotland looked at my feet but people on our RS tour wanted to know where I got them.
My point being, take a loved pair of sturdy shoes/low hikers with a some tread on the bottom. You'll be on your feet a lot and Scotland is an unpretentious place, in my opinion. We had some very nice weather but it will rain. That little bit of extra height around my ankles kept me cozy and dry. Especially on our walk to a restaurant in Oban during an exciting storm.
I don't know where you live, but here in the Pacific Northwest, everything I wear here was perfect for Scotland. Including my old boots.