University Help :)Watch
I applied to Cambridge, Durham, Warwick, Imperial and St Andrew's. Lowest standard offer was AAA and others were A* AA or A*A*A. I did ask for feedback but it was vague and just mentioned high competition.
I doubt that as you have Maths A level and that is the key subject for Computer Science. Many universities include business as one of their referred subjects and those that dont accept it as a 3rd subject alongside 2 of their preferred sunbject. The only issue normally with Business is that universities wont accept it along with Economics as they are too similar. What is your other A level subject and what grade were your GCSE grades in Maths and English. I think there has been a bit of a spike in Computer Science applications which might have caused you some problems.
I'm a little surprised that you didn't get any offers, or decent feedback. I would have expected one from Warwick, the others being more of a lottery. Further Maths is strongly recommended at the Oxbridge / Imperial level - do you have that?