Right, having lived in Glasgow for a year I'll give you some decent advice. You probably will need ID (i.e a passport, drivers license, or a nationally recognised proof of age card like a Portman card, although not every club/pub is obliged to accept them so using one can be a bit of a lottery). I'm assuming you'll be heading out for a night in the town, going to a few pubs and maybe a gig venue/club later on? The majority of the biggest and well known clubs in town like Garage, ABC, Bamboo, Cathouse e.t.c all check ID as a matter of course when you get to the door and so do most of the pubs. The places I've just mentioned are the places you'd probably go for a night out if you were visiting Glasgow since they are the most well known - obviously you will be able to find smaller and more obscure places which are laxer with ID policy, but they're likely to off the beaten path and you mightn't get as good an experiance as you would in a 'proper' club. Obviously, if you look the legal age or substantially older you might get away with it - as you suggested the way you dress may affect this somewhat, but I would put my money on you getting ID'd at least once during the evening. As for the arrest thing, you aren't going to get carted off by the Police just for trying to get in. The bouncers will just turn you away. Last thing, how old are you? If you are 18 or over, it would probably be worth taking your passport with you - It might be out of date, but I reckon most bouncers aren't going to be bothered by that, or even check it for that matter. I would assume that they'd just check the photo and the date of birth, though this is just my personal opinion. There's a guy on here who actually bounces in Glasgow - his user name is Rob Thomson, so if you PM him I'm sure he could let you know how the out of date passport thing stands. Cheers, Strath.