I have a conditional offer from UCL for Pharmacy. I had 5 A*s (English Literature, English Language, Chemistry, Science, Graphics), 5 As (Biology, Physics, Religious Education, Art, Statistics) and 1 B (Maths). However, their website simply states that 'grade B or higher in GCSE Maths and English Language' is required - so as long as you meet these requirements and their other entry requirements I don't think GCSE grades are particularly important.