The situation sounds horrible :-(
When my sister had cancer, she was given all the help and advice about this kind of thing from her "cancer nurse"? I think that's what she was called. Anyway, it was the person at the hospital that dealt with her on a daily basis. I would also suggest Macmillan, but do speak with the hospital nurses that are dealing with your friends father.
Have a look on the Macmillan website, as there is loads of information on there. Things like help with financial support, carers, and bereavement. I know your friend won't want to think about that just yet, but as a friend who quite obviously cares a great deal, maybe you could have a look at it to help you support your friend.
http://www.macmillan.org.uk/Home.aspx
Best wishes x