Thought I should get down a few thoughts before I forget them! I just got home last week and it already feels like so long ago.
Edited to add Clothing: You can stop worrying about what you wear to the UK. The general aesthetic here is "who cares". Unless someone is going to the work or are a youth out clubbing, they look like the rest of us schlubs. Sneakers with dress? Fine. Jeans at the theater? Fine. Printed t-shirt and shorts? Fine. Maybe dress if you're meeting the queen or going somewhere special, otherwise save you're worrying energy for the transportation system.
Scotrail: Not sure what’s happening with them and strikes, but they were cancelling trips up to a couple days before. Check often, including right before traveling.
Glasgow: This is a great city and should be given more consideration than a day trip. Unless you don't like cities, in which case, never mind. But it was fun! I stayed at the Ibis Styles St. George Square. I'm sure I had a good reason for not staying at the Grasshopper that comes so highly recommended, but I'm also sure I have no idea what the reason was. This Ibis was perfectly located south of the square, with easy walking to the Argyle shopping street to the south, lots of restaurants, and not too far to Central Station, but most easily accessible to Queen Street Station and the City Sightseeing Bus. I stayed at a couple of these in Poland and like this chain, as far as chains go. The museums- Kelvingrove especially and the Tenement House- and all things Charles Macintosh are the best reasons to come to Glasgow. It was also an easy train ride to Balloch to do the 2-hour boat tour of Loch Lomand. There is a one-hour but if you have time, the longer tour would be worth it. I didn't get to Helensburgh to see the Hill House but there are trains to get there from Glasgow and buses between Helensburgh and Balloch. The problem was that the buses are a couple hours apart so if you miss one, it's a long wait. I wasn't willing to risk it so will save the Hill House for next time. The House for an Art Lover, though, is in Glasgow a bus ride away from the center and worth a trip out. It's in a nice park which provides a nice walk from the street to the site. The cafe looked busy enough although I didn't eat there. The City Sightseeing hoho bus is great! It actually goes to most sites on a tourist's list, and I used it to get around to as many as I could fit it on the first day. Adding a second day is only a pound more, so worth doing. That second day I wasn't ready to go back to the hotel so rode it around town once more just for fun. It's not a bad evening when the weather is good and the sun is going to be up until 10pm anyway. (The bus does make it's last run at about 19:30 though). If you're interested in a whisky tasting, then definitely contact the Pot Still. They need at least a weeks notice but it's so worth it. I'm not a whisky drinker but told them what I do drink and the bartender pulled things based on that and he then talked to me for an hour and a half about whisky, distilleries, production, etc. He even found a few that I liked! Now I have to make room on the booze shelf for whisky too.
Glasgow tl;dr: Make reservations at the Pot Still for a private tasting and do the City Sightseeing bus. Also see Mackintosh stuff.