Like you said, chem and bio are the main 2 a levels you do need.
It's ok if you don't want to do maths, it shouldn't disadvantage you by a lot (depends on the university however); physics is a good choice and is generally accepted by many universities.
Business studies/Economics/psychology/geography/ pretty much any other 2 subjects are fine as long as you have those two, as typically universities ask for chem and one from maths/bio/physics
The main tip I have is to research into the skills needed to be a pharmacist and match those skills with other a level subjects offered to you.
I hope that helps and good luck!