I rung up Glasgow today. They're really being quite vague about this new selection process, saying "we consider everything together". If anyone can get some more precise data on admissions, that would be really appreciated.
Anyway, from what they said, last year they gave people interviews with UKCATs between 2570-3490. The applicant to interview ratio last year was roughly 2000: 600/700. There are 250 places.
And also, from what they said, it seemed like they don't really care about your GCSEs much (but i could be wrong about that).
Anyway, good luck with all your applications!