Glasgow are great. Never had a problem. Edinburgh likewise, occasionally held at the bridges but then usually cleared through the overhead. Prestwick good too, they just seem to prefer a wee bit more notice if you can give it.
All in all a good experience in Scotland.
Just remember, if you sound confident and is if you know what you're doing you'll generally get what you want.
If you umm and errr and think with the mike open, you immediately raise suspicion that you migth be a potential idiot.