Could I get in for law???

Law at Brunel? With A*A*AA?

With grades like that, you'd be better qualified than the head of the law department.

Hahaha really?? I wanna apply here as a backup but I don't know what my first choices should be.. Any recommendations?

All the A*AA courses: Cambridge, LSE, UCL, KCL, Durham, Nottingham, Queen Mary and Oxford (which is AAA).

But I don't have good O'levels. Isn't that the deciding factor? And I forgot to mention that A*A*AA are my predicted grades but I'm sure they're what I'll get or better! (Thank you for helping me out btw)

It's not the deciding factor, no. It makes it harder to compete to get into those unis, but you still have a strong application and you certainly should consider applying to a couple of them. Brunel should be your last resort. Your absolute rock bottom.