Ah yeah, that lack of chemistry is going to be a problem. Also the fact that you are a resit applicant (I am assuming you didn't get AAA with your other subjects) will also limit you to some medicine foundation courses (which would still have been a better route in than transferring.)
I actually took 5 A levels (6 if you include General Studies
[but no one does]) consisting of Chemistry, Biology, Maths, Physics and Further Maths.
THIS WAS TAKEN OVER THREE YEARS AS I RESAT (I'm not a clever clogs). I transferred from Biomedical Genetics.