Applying directly to the university (rather than through UCAS) and having a successful interview, sometimes along with some basic tests, can make a real difference in A level entry requirements. It's good that postcodes and schools can be taken into account, as well.
There's nothing fair or consistent in the application process anyway - or education in general - never has been. We just like to assume that there is. How could it ever be made fair?
A levels aren't really a good preparation for a degree course. Results are more like a filter, denying access to many at one stage, yet of little importance later, when a mature student applies.
Doodledog, it's upsetting to see some youngsters struggling and/or dropping out, when they've had every advantage through their school years, perhaps been spoon fed - then need to settle into independent research, in-depth reading and turning out a decent essay on time. Some are totally out of their depth.
By contrast, those who've already struggled at school may have acquired (along the way) better study habits, far more determination and a realistic, mature attitude that's a great advantage. I really admire them.