You get
Tuition fee loan - non-means tested, repayable, £9000 pa
And then for living costs
Maintenance loan - means tested, repayable on the same terms as the tuition fee loan
Maintenance grant - means tested, non-repayable
For those sums, use the student finance calculator www.studentfinance.direct.gov.uk/portal/page?_pageid=153,4680136&_dad=portal&_schema=PORTAL
Finally, for those on low incomes, there is a university bursary available, which is means tested and non repayable. This is administered by the university, using data from Student Finance, and if you're eligible then you are guaranteed to get it. To find out how much they're eligible for (NB the better universities usually give more) you'll have to have a look at the individual university.
For those on the lowest incomes (I think the threshold is £25,000pa household income, with amounts given tapering gradually with increased household income over that amount), you would get
Tuition fee loan - £9000
Maintenance loan - £3875
Maintenance grant - £3250
Bursary - as mentioned before it's variable, but at University of Manchester (the country's biggest university) it's £3000 in the first year (£1000 cash, and then £2000 off either halls or tuition fees) and £2500 (cash) in subsequent years. www.manchester.ac.uk/undergraduate/studentfinance/home-eu-2012/university-scholarships-and-bursaries/
This is most definitely enough to live off. £10,125 a year is a princely sum for a single adult - I (as a student) have spent about £9000 in the last 12 months - and that includes a trip to France, trips home, participating in a fairly expensive sport, a house deposit for my second year house (£300) and two months of summer rent (£660!!)
If you have a higher income, then you will be expected to subsidise your offspring. However, you have to remember that you will no longer be paying for their food, hot water, extra-curricular activities, bus fares, school uniforms etc. etc.
There's lots of info here, including a myth-busting guide www.moneysavingexpert.com/students/student-loans-tuition-fees-changes