You should think about applying to Oxbridge with those AS Grades, I got 6As at GCSE and the rest Bs, and was invited to their summer school for Law as they took into consideration the context of my school, and I was predicted BBBB at AS. I think as long as you wow them in your personal statement/interview you should be fine. You should hopefully, very easily, get into a Russell Group Uni with those AS Grades, well done!