As mentioned, avoid GCSE-heavy unis like Brum and Oxford.
You need to look at individual medical schools' entry requirements to get a better idea but you should be okay for most medical schools. I'd suggest trying absolutely 110% for your A Levels and (eventually) UKCAT/BMAT, though, as they are bigger parts of your application. You should probably also look to start looking for work experience and/or volunteering as soon as possible.