Hi, if you want to do Pharmacology as part of Cambridge's Natural Sciences course, you will almost definitely need maths at A-level (some colleges say they only require 2 sciences at A-level, however the majority of applicants have 3 or 4 sciences so only having 2 could put you at a disadvantage).
From what I know, Bath, Bristol, KCL, UCL, Cardiff, Manchester and Southampton only require 1 or 2 sciences at A-level for their Pharmacology courses, however I am sure there are others as well!