SR1 Form and PIP Form

I wrote about 4/5 hours ago and seem to have lost the post I asked help on.
I just need some advice on the SR1 Form and Standard PIP Form.
My wife was diagnosed with Stage III lung cancer yesterday when we met with her Oncologist and MacMillan nurse.
Due to the size of the tumour, the fact she has an entire collapse of the lung and mass in the airway and the fact they cannot operate or carry out radiation, they are unsure how long she may have to live with just chemotherapy. The Macmillan nurse said she would qualify for PIP under Special Rules and not to worry as they will sort out the paperwork and also a blue badge for her.
This afternoon, out of the blue we got a call from Citizens Advice who basically said we had to apply for a PIP form from DWP. I said surely the SR1 Form meant she did not have to fill out the standard form and also the SR1 was filled out by medical professionals and sent direct to the DWP so why would we need to apply for the 50 page PIP form? He said the guy from Citizens Advice who normally did the paperwork was on holiday and back in the new year so he was just getting the ball rolling and I needed to contact DWP on my wife's behalf. I really am confused. Should I go back to MacMillan nurses or should I contact DWP. I really do not want to get involved in this as I know the SR1 form is for those diagnosed with less than 12 months to live and I know just how awful the standard PIP format is and the process you have to go through hence my lack of wanting to be involved. Surely between medical staff and Citizens advice this could be sorted without dragging us into the equation.... Any help is appreciated.

Sorry Gary, just me being a bit paranoid as when I looked a short while ago I could not find it and sent it again.