You only have 4 Unis, correct? As a prospective medical student, you're already pretty tied right now, you have to apply strategically, here's how:
1) Don't apply to anywhere that prioritises the UKCAT/GCSEs, if you can, try go for the BMAT because some Unis will take that in preference. (If your personal statement is exceptional enough/A Levels then you might get away with it)
2) Take a Gap Year: You'll probably be able to potentially re-do some A Levels, as well you'll also be able to build up an even stronger personal statement, if you build it up enough, unis will take that any day of the week, but be prepared to work hard.
3) EUROPE: Apply in Eastern Europe, Bulgaria, Slovakia, maybe apply in other places like the Netherlands, not only do these have good quality facilities, but it'll also mean you'll be able to practice EU wide too, just the same as a UK one (for now at least.), consider this if money/travelling is not an issue with you.