@Marchesman What are you basing the PBL comment on?
Out of interest, what is your medical speciality? I can see that some areas of medicine require a strong, instantly recallable knowledge of biochemistry (especially endocrinology, but also nephrology, hepatology, respiratory and anaethetics) but I think many doctors acquire this during the early years of specialist training, while most others in other specialities get by on medical-school-level biochemistry. Knowledge of pure chemistry isn't closely related to most kinds of clinical reasoning, and medical-school-level biochemistry doesn't require A-Level chemistry to learn.
Personally, although I don't work at Newcastle, I think their approach of having no A-Level subject requirements but rather relying on good A-Level grades and UCAt as evidence of students' ability to learn the stuff they will be taught at medical school is probably the right one. There is a fair bit in A-Level curriculums that is over-simplified or simply wrong (the latter is noticeable in biology and psychology; I'm not aware of any frank inaccuracies in chemistry), which means anything essential really needs to be re-taught anyway.
Medical schools score much better in NSSs the more time first to third year medical students spend chatting with patients rather than in laboratories and lecture theatres.
I don't agree with this at all. Nothing that happens in the first two years appears to have much influence on NSS scores for a five or six-year course. Students' comments in the NSS are all about things that have affected them in the last two years, most often to do with placements, access to skills labs & libraries, and timetabling (and lack of parking, obviously). And students don't spend time "chatting with patients": they spend time acquiring communication skills and learning thow to take a history. We expect our students to be able to be competent to take a reasonably simple history by the end of year 2 and to have basic skills in physical examination so that they are equipped for placements in year 3 (which make up the majority of their time in years 3 & 4 and all of their time in year 5).
Believe me, year-2 students want more lectures because they are obsessed with exams. Making them learn how to communicate with patients makes us very unpopular. So if what happens in year 2 influenced NSS scores, the way to improve scores would be to do more lectures and have less patient contact. But our job isn't to get good NSS scores: it's to produce good doctors.