Justgettingonwithit, I was in in the same sort of situation. I am also deaf; so it was quite hard for me and I don't work in term-time, I couldn't find a job this holiday either. But I'm still Ok (slightly, but not massively overdrawn, with three weeks until I get SF). Like II said, I have PTSD and I work so hard and so long for my grades, especially as I've not done GCSE or A-Level in my subject area (mature student).
Disabled Students can get housing benefit, I've heard, so he might qualify. He could also try access to learning funds. I agree with you- there is a lot to be gained from degree level. I want to teach in HE now, I've loved my degree.
It can be done, you just need to be careful. It can be very, very tempting when friends are going out, on holiday and everything, not to mention disheartening. But I always think of the long term gain. In the long run, graduates end up on better salaries. Not me though, I'm going on to an MA (I hope!).
Silverapples, I was on benefits before uni (long story, quite a horrible time). I started with nothing, I have nothing more. But I'm a lot more intelligent than when I began. So, you don't need all that much money. Just coffee, lots and lots of coffee, to study.