I think it doesn't matter. The best Law-schools in the U.K. are Cambridge, Oxford, LSE, UCL, KCL, SOAS, Bristol, Durham, Nottingham, Warwick; London confers a logistical advantage, while a 2.1 from Oxbridge will guarantee consideration at the most elitist firms. York's Law department is nascent, but likely to be deemed on a par in short order.
There is no 'top five' in any meaningful sense.