The source of this rating is the Guardian. The Guardian takes into account reliable information such as the percentage of students satisfied with courses, teaching or feedback. The unemployment is also reported with a special criteria based on the percentage of students who have a career in law after 6 months.
As you can identify, some universities are on the same level.
1. Oxford
Find a BCL and MJur at Oxford
2. London School of Economics
Find an LL.M. at LSE
3. Cambridge
Find an LL.M. at Cambridge
4. University College of London
Find an LL.M. at UCL
5. York University
Find an LL.M. at York University
6. Queen Mary University
Find an LL.M. at Queen Mary University
7. Durham University
Find an LL.M. at Durham University
8. University of Warwick
Find an LL.M. at University of Warwick
9. King's College London
Find an LL.M. at King's College London
10. University of Dundee
Find an LL.M. at University of Dundee
11. University of Edinburgh on a par with University of Newcastle
Find an LL.M. at University of Edinburgh
Find an LL.M. at University of Newcastle
13. Nottingham University
Find an LL.M. at Nottingham University
14. University of Glasgow on a par with University of Lancaster
Find an LL.M. at University of Glasgow
Find an LL.M. at University of Lancaster
16. School of Oriental and African Studies
Find an LL.M. at SOAS
17. Robert Gordon
Find an LL.M. at Robert Gordon University
18. Southampton
Find an LL.M. at Southampton
19. University of Sussex
Find an LL.M. at University of Sussex
20. University of Leicester
Find an LL.M. at University of Leicester
Source : The Guardian
For full rankings or further information about the Best Law Schools Rankings Methodology, please refer to this link