Some Universities offer grants to help with this. And the maximum maintenance loan is a pretty substantial amount, which you can get if you come from a low income household.
My family earns (well... gets, father was disabled during work for the NHS and lives on benefits, and my mom cares for him. Long story :_: ) about £12,000 a year or less through PIP and so I get the entire student loan, which was £8,700 this year. Frankly, that's enough for rent and food/sundries for a year, even in the place I study, Edinburgh, which is quite pricy. Rent is about £600 a month including bills (on average, I don't pay any actually, I love in my uncles flat... BAD EXAMPLE I KNOW BUT YOU GET THE IDEA!) and that leaves about £3000 after you consider the fact you'll only be there for nine months. In any case, enough money.
If you pick your Uni carefully, the grant can help a lot, as I mentioned. UoE offers a £7,250 yearly grant for all five years or four, or three, etc, for your course. Other Uni's also offer similar means, though the UoE one is probably the biggest. In any case, the grant helps a lot, and other Universities will have similar ones, putting you in a decent position.
In any case, the loan and whatever grant you get should be enough.
(Just a note, if you do the math, I actually get more than my parents get in a year through the loan and grant combined. It's pretty crazy up here in Scotland! If you're a native from Scotland, they even give you free tuition! I wish that happened in the UK ;( )