Maths, Physics, Chemistry (Further Maths).
Not all medical schools require Biology for admission, and students do apply with the above combination(s) successfully - notably two Syrian refugees in the last cycle did so (one did FM, one did not).
Further Maths would be highly recommended if you are realistically wanting to consider Physics. It's pretty irrelevant for Medicine though, where the primary requirement is chemistry, and beyond that a generally scientific background.