I applied for Oxford this year with Double award AVCE Art and 2 A levels, and was rejected. However, I'm sure this was more to do with the interview than the actual qualifications. Before applying, I asked a representative of Oxford uni whether they would take AVCE and they replied in the affirmative, so go for it.
However, I would warn you that some universities don't take vocational qualifications for the more competitive courses. At a warwick open day, I asked a admissions tutor whether they would accept my qualifications and they said yes; when I was rejected without interview, I was slightly mystified so checked the UCAS site and it said that they didn't take double award AVCE's. I had been given totally false information! You have high predicted grades, so you shouldn't worry, but phone some admissions tutors anyway, just in case.