There is probably no consensus as to which universities are the best places at which to study law, or even on what "best" means in this context. Obvious names to mention are Oxford, Cambridge, UCL, LSE, and KCL. People debate endlessly the relative merits of Bristol, Durham, Nottingham, Warwick, QMUL, York, and so on. Your predicted sixth form grades and other aspects of your academic profile will determine which universities you can apply to with a realistic chance of obtaining an offer.