Hi!
I am a student from Greece, I finished highschool this year, and I'm starting my course in September. Since I went recently through all the university stuff, I have a little experience on the topic. Edinburgh and Glasgow don't accept the greek apolytirion on its own merit.Unless you also take the panhellenic exams. But they usually ask for additional A levels. Are you taking any A levels? Or doing the IB programme?
Stirling was one of my 5 university choices. I applied there but I withdrawn my application before I get an answer from them, because I decided I wanted to be in England. Dundee, Heriot Watt and Aberdeen are also very good ones.