If you miss your first choice by 1 or 2 grades most unis are flexible enough to accept you, seriously even oxbridge give a little slack unless youre a total f***up then you will die because universities send out assassination squads to these people.
I wonder if they let you in if you don't make 2 grades. (e.g. they want ABB, and you get BCC).
Sorry made a mistake in the last post. That's quite good that some uni's might take you on although you have 2 or 3 grades off. If your personal statement and/or reference is good, they also might let you in.