Sara, do you mind me asking what sort of qualifications or experience you've got that's got you a place at Bristol?
I'm hoping 11 GCSE's 1 A, 7 B's and 3 C's - (B in Maths, B B C in Chem, Bio, Physics, C in Eng), AS Levels in Chem + Bio & a BTEC in Forensic Science (Merit Merit), and a 2.2 BSc (Hons) Forensic Science with focus on Chemistry, Forensic Biochemistry, Forensic Biomolecules etc... and a bit of work experience in a specialist science school will clinch it.
With that, I'd be surprised if you don't get a place. The only reason I could see for your being turned down would be them running out of places (it isn't a case of them getting everyone's application and picking the best - instead the course just fills up as they take people in - although I presume they skip the degenerates...).
I was interviewed on 9th of Dec and accepted by the 11th

If you want to know -
12 GCSEs (3 of which short-course so only 10.5 really), 4xA*, 1*B, rest As
4.5 A2s (A B B B C: Physics, Design-Tech, Economics, Maths, AS Further Maths)
BEng Engineering Design w/ Study in Industry (specialising electronics/comms) - 2:2
...and coming up to 4 years working in the electronics industry.
I started off so well and lost the energy as I specialised more and more narrowly - I'm itching to get back into delving into the whole spectrum of science and physics again

For the interview at Bristol they asked us for a 3-min presentation about introducing a new topic to a class of mixed-ability year 8s, I'd assume that's standard - just be interesting, prove you've thought about it, be aware that kids vary, etc...