Rank University
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

According to The Guardian University Guide, 2006:

Rank University
1 University of Cambridge
2 University of Oxford
3 London School of Economics
4 University College London
5 Imperial College London
6 School of Oriental and African Studies
7 King's College London
8 University of Warwick
9 University of Bath
10 University of Edinburgh