Remember...these are just rough guides.....the actual ranking of Universities would differ with each subject.
1 University of Oxford
2 University of Cambridge
3 Imperial College London
4 London School of Economics
5 University College London
6 Loughborough University
7 University of Bristol
8 University of Warwick
9 University of Bath
10 University of Durham
Sorry for the late reply, I didn't notice your post before. With regards to your question:
1. Cambridge
2. Oxford
3. Imperial College
4. Edinburgh
5. Manchester
But remember, if you are applying to study Medicine, then ANY university is good, because they all need a high standard of teaching to be able to teach medicine, and also, medicine is very competitive, so as my cousin put it "the best university for medicine is the one that accepts you"