I think most unis (mine certainly does) do like a 'catch up' module during the first couple of weeks. It's to get all the students to the same level of knowledge as content varies between exam boards. And even then, the biology covered up to now goes beyond the content of a level that in some sense previous knowledge isn't going to be a great help (plus some a level stuff are 'not true'). Hence why some unis do not require biology.
That said, not having biology is going to limit your options greatly. Based on info I can remember for entry during modular A levels, you can throw out Birmingham, BSMS, Cardiff, Exeter, Hull-York, Imperial, King's, Lancaster, Leicester, Liverpool, UEA (Norwich), Nottingham, Southampton, St George's and UCL. Of the ~30 medical school, that's half gone! So really consider if that is the wisest option.
Not to mention that some of the remaining unis have very high weighting on other aspects. Bristol needs a VERY good personal statement on why medicine (and judging from another thread you have, medicine may not be on the forefront of your mind at the moment), Newcastle almost always have ridiculously high UKCAT thresholds (except for that one glitch year...), Keele LOVES their Roles and Responsibilities form (plus they are one of the few unis now asking for A*AA). So yeah, consider your options.