Well, technically..
Basically, there are 3 levels of support. Living with parents, living away, and living in London.
If you live with your parents, you get a bit less because it's assumed they'll support you still, which I suppose is fair enough. If you don't live with your parents (and it doesn't actually say where you have to live, just that you don't live with your parents) then you're entitled to more. You don't have to live in halls to claim this. I live at home (obviously, because it's where I live!) but not with my parents. Stupidly (?) they still want your parental income even if you don't live with them so as my dad declared an income of about 4900 quid for the relevant tax year (deductions from his self employment etc) I get everything.
You'll always be better off claiming the full loan and not living in halls even if you live with your parents as you don't have to pay over 100 quid a week rent. You're even better off living away from home but not in halls and claiming the extra on top of that but the reality is most people aren't in that situation unless they own their own house.
Obviously if you live in London you can claim extra as living expenses are higher as well as rent for halls but I don't know the ins and outs of that as I'm not in London.
So, to those who negged my previous post, that's how I get max grant/loans. I haven't applied for halls, but I don't live with my parents either. Stick that in your pipe and smoke it.
That being said, I come from a house with a low income regardless anyway (where I live now is a low income household that would still entitle me to maximum support) so I'm not claiming anything I'm not entitled to.