Look at if any unis offer bursaries you may be Eligible for, in my first degree I got a bursary because I got good grades which I applied with.
Also I personally use an overdraft. As a student it's 0% interest and I can now get one of up to £3,000. The only issue is to be aware that you do need to pay it back and interest will start when you leave uni, although myself like many others work on top of uni to pay this off as we go along.
Only other thing I can think of is living in private accommodation. Halls is so expensive. Used to pay £104 a week in halls and this was the rubbish 'budget' halls which resemble a prison. My private place is £116 a month less which is over a grand a year difference. If you're really on a budget it's definitely something to think about!