Sounds interesting, but in my experience people in hospital are generally too unwell to forge social hierarchies and desperately want to get out. Saying that though, last time I was in hospital (a year ago) I found that I got on with the people there much better than I do with normal people. This wasnt through being social with them though, it was through not judging them, them not judging me, and being kind to them which they really appreciated (and helping them made me feel better too). I was there for only 3 weeks though and people changed wards very frequently so maybe there wasnt the time for this sort of social hierarchy to build up. When I left I was sad to be leaving so many people I had come to consider as friends and who I cared about more than the people I had worked with for two years.
I would like to see the TV series, but not being in the UK I cannot. Perhaps I will buy the book.