If you are eligible for Contextual offers - check carefully on each Uni website as every Uni uses different criteria - that you only need to meet the Contextual offer grades to be considered, not the 'standard offer' grades. Just be aware that UCL and KCL are bonkers-competitive - not because they are 'better' (they aren't) but because the supposed glamour of being in London means they will get thousands of applications, and can therefore be very picky.
Out-of-London Law Unis like Bristol, Nottingham, Leeds etc are more likely to consider you for an offer but check which Unis require LNAT - you need to register/book a test slot now as they will already be filling up, and there is an earlier cut-off date than for submitting your UCAS application.