Obviously if you're a patron at a busy pub in the UK, you can't wave your hands or make a point of being FORTH RIGHT and saying that you're next; SORRY, that's just the rules, Yanks.
What can I say, they like rigid social codes over here.
Firstly, I won't question why it is a Scottish man in particular that you want to date because hey, I get it: you saw Gerard Butler in a film once and dug his accent and assume that all Scottish men are that rugged and handsome.
[: I saw Gerard Butler walking down Byres Road a couple weekends ago with this current-model girlfriend, and although my heart was a flutter at the idea of Gerard Butler, in reality it was a bit of a let down as he looked pretty hung-over].
You will need to carry out a careful conversation and only when it is hinted at, may you ask someone what they do or openly try to guess.