Yes, you should absolutely try for it. The only way you definitely won't get a place is if you don't try. Grades are just a part of how you perform, they don't define who you are, so other things like personal statements and AS and A2 grades also come into it. Good Luck OP
Yeah Downing takes more lawyers, but pretty sure they're all as good as each other (as in VERY good), dad went downing, had some amazing tutor apparently who taught john cleese..
Might also have taught Nick Griffin so it's not all good news