A number of universities especially in London rely on the LNAT for Law so in addition to your A levels you will need to check whether the university requires this. As an example Bristol scores 20% GCSE, 40% A level 40% LNAT. Most RG universities will look for either A*AA or AAA. It is possible some may accept AAB with an A in EPQ but you will need to check the entry requirements. There are only 24 RG universities so it shouldnt take that long.