Your qualifications are pretty standard. I don't know how the interview goes. Obviously something in your application impressed them. If you get a scholarship, that's great. But there are reams of candidates with 3 As and a 2:i from a good uni, some with a masters, and more don't than do get pupillage. If you don't get the scholarship, I'd give real consideration to whether you'd be content to try to become a solicitor--most people don't make it to the bar, so you're taking on a lot of debt for a relatively small chance.
I agree with jjarvis. i'm sorry if it sounds a bit negative, but you will probably need the scholarship to set yourself apart from all the other extremely well-qualified candidates who're aiming for the Bar - just take a look at the Pupillage 2011 thread here to see how much agony is involved!
but if you do get a scholarship, it's a bit like getting a seal of approval - so that'll help. if you're looking for interview tips, try the Inns of Court scholarship group on facebook: http://www.facebook.com/pages/Inns-o...37476092932632 I know it has some GDL scholarship tips.
one thing you'll definitely be asked is: how do you know you want a career at the bar if you haven't done any mini-pupillages? that's something to really think about before you go in.
hope that helps.
PS: it is very possible to get a scholarship without having a mini-pupillage under your belt - one my friends did - but you need to be pretty phenomenal and convincing the panel that you're committed to a career at the Bar!