I claimed for DD (although she came home at 9 weeks) but put on the form that she was still in hospital. I had no questions about it from the CB people.
It IS difficult, we had a free parking permit at the first hospital, but we either had to drive a 150 mile round-trip daily, or, as we chose to, got a hotel room nearby. There was no financial help for this. We ended up about £1000 out of pocket.
However, we got a cot from a friend free, clothes and Moses basket as gifts, etc. As long as you are willing to accept help, there are often places you can find it.