Hey!
Congrats on getting an interview for Glasgow! One step on the pathway to the best vet school (IMO!)
I don't think I'll be much help with the interview tips as mine seems so long ago now.
From what I can remember my Glasgow interview was pretty casual and straight forward. There were about 4 people on the interview panel the day I went but I think it varies depending on who all is available, but I couldn't see there being much more than that. I think they asked me more about myself than anything veterinary related. I'd try and keep up to date with current issues in VetMed/Agriculture like Blue Tongue, Foot & Mouth, Bird Flu, Pet Obesity etc. Just general stuff, they won't expect you to know things inside out or in great detail, thats for when you get here... and heck even then I don't have a clue sometimes!
If they notice something interesting about you on your Personal statement, a hobby or sport etc. they'll probably pick up on that and want to talk about it. I really would try not to worry too much about it. I know everyone says just be yourself, but really it is true!
Oh and EMS is always a good talking point, try and have an interesting case that you've seen to talk about.
Thats about all I can remember!
Best of luck!