I couldnt comment for medecine. In fact as with all University degree applications it will pay dividends to ask them directly as to what they prefer. Take Portsmouth for Biomedical Science for example. It says on their site for the Biomed degree "BBC from 3 A levels including Biology plus one other pure Science subject or Mathematics." Yet the admin tutor e-mailed me back with :
"I would advise this student to study any of the following options within the access course, as these will be beneficial when applying for the BMS degree:
Human Biology
Chemistry
Further Chemistry
Health Studies
Biology could be an option but is mainly based on plants, human biology would be much more beneficial as the BMS degree will be concentrating on the human body."
I took, in the end, Human Biology, Biology, Chemistry an Further Chemistry. Left nothing to doubt.