There's no such thing as a best or worst medical school in the UK, and entry requirements are frankly a stupid way of attempting to categorise them for those purposes. Your GCSE's preclude you from applying to Birmingham, and you should avoid Kings, Oxford and Cardiff too. Your UKCAT will rule in/out others who set specific UKCAT boundaries, and then you can narrow it down by decideding whether you want to do a traditional or integrated course, and whether you want to do PBL or not.