Yep, it's a real phenomenon: pluck us from our usual, familiar surroundings, and drop us in a foreign land, and suddenly much of our learned experience, common sense, and ability to just know how the world works suddenly vanishes, since we're nervous, excited, just slightly disoriented, and we quickly become surprisingly vulnerable to scams, confusion, and simple misunderstandings that we would see right through if we were at home. Something about how we're wired I suppose.
Perhaps for the same reason, the first few minutes behind the wheel in a foreign country are extremely dangerous IME, even if you have oodles of experience driving overseas on previous trips. For me, every time I get in the drivers seat on a trip I need to talk myself through the first few minutes and be extremely cautious, thoughtful and deliberate with the driving tasks (and I've driven quite a bit around the world). There's some a kind of mental reset required, then after about 15 minutes, it's all familiar again and my internal mental "automatic" tasks become familiar again.
Have fun driving through Scotland. It's beautiful!