Hi there, you passed all your GCSE's and more specifically an A in English which i presume is a prerequisite for a law degree at either university? I know lots of Universities require a grade B in math but you should probably look at their required qualifications!
My GCSE's if im honest were ****, i did no work for them and i paid the price for that, however i obtained grade A's in English, Math and Latin but otherwise mostly C grades; i applied for Exeter, Glasgow x2, Royal Holloway, and Reading, receiving offers from all!
Basically if you've preformed poorly in your GCSEs but have shown maturity and progress in your A-level studies (which are significantly more challenging) then you should get offers! Law is a very densely applied to course but with a strong PS and solid predictions you should be ok!
Hope that helped