I've done loads of domme sessions in my time, and even today the type of session I want depends on my mood.
I started many years ago with just wanting bondage and a bit of a whipping, got very much into nipple torture, then strapon and anal on me, and no pain, but more recently quite like the pain of canes.
I've also tried water sports, needles, and many other things, and the main thing I like is giving up control to someone who knows what they are doing.
I never get up to Glasgow, but I'm sure it will be similar to here, where you get a variety of looks, services, prices (sone of my best domme punts have been really cheap), so not sure what to advise.
As others have said, work out what you want and do some research - feel free to put potential SPs here to get feedback, and think carefully about what you want e.g. if the atmosphere of a dungeon with leather / latex / PVC is important, you're probably not going to get that in a parlour or indie.
You will almost certainly get the sexual release, and if I had to put figures against it I would say my experience has been:
Less than 1% of places did not result in a happy ending
90% of non-dungeon experiences can get very sexual
- a lot of these (60%) can include full sex
about 30% of pro domme / dungeon experiences can still be quite sexual with a bit of RO etc.