I've no idea what a prepper is either!
Taz - yes, although I find that when I join a class, people smile and talk. But to strangers, no. Plus I've known one really nice woman from my class for 2 years now and I'm still a bit nervous to ask her for a coffee.
I'm from South Africa where everyone is instantly friendly (or hostile: depends!). I think it's the sheer no of people here; people guard their own space.
It was one of the hardest things for me, coming here. First time I walked on the narrow paths in the local park, everyone avoided eye contact which was absurd and a bit depressing. Even in France, you'd say 'bonjour madame/monsieur' even if it's not that friendly.
And don't try to talk to anyone on public transport! I spent 2 years outside of London, in the south east, and didn't find it much easier to be honest. Mind you, I was in a town that has a reputation for being a bit closed up (Lewes), very pretty though.
Glasgow sounds really friendly! Pity about the weather