Hildas also is £150 prepaid meal credit a term. And I'd be pretty surprised if you didn't use it all up. Eating fairly liberally, I get through the initial £150 by halfway through the term.
Any college you go to, you'll be able to get financial help if you need it. They're not going to let anyone go hungry or drop out because they don't have the money. Besides, food is only a fraction of the cost you spend on tuition fees and accomodation, and probably doesnt vary too much from college to college. Im told some colleges dont have any kitchen facilities, so it might be worth checking that would if you want to save money cooking your own stuff.
*wherever* you apply, theres a good chance (i think its about 1/3?) that you get pooled somewhere else. And as others have said, everybody ends up being happy where they end up. I really wouldnt worry too much about applying to a more oversubscribed college. The pooling system, is I think, about as good as it can reasonably be.