Hello morbidstorm, what you will need to do is get the death certificate from the hospital, then you will need to register the death, with your local registry. Once you have done that, you can then contact the funeral director.
Do you have any other brothers or sisters other than your uncles who could help with the costs? If not, now I know this sounds awful, but it may be a way of helping. Are any of your if you have any brothers or sisters on benefits? If so ask one of them to register dads death, that way the initial cost of the casket and 1 car will be paid for. As I said I know this sounds awful as it's your Father, but it's the only way I can think of without you getting the massive bill.
If you dont want to do this then after you have registered your Fathers death and have contacted the Funeral Directors ask them about weekly payments as they can do that too.
Just a quick note, if you do have a brother or sister on benefits and they can sort it out, don't you or anyone who works full time put something in the obituary in the local paper, again this sounds awful, but the benefits agency will go through the local paper.
Take care and my deepest condolences to you and yours.