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Well, I think I have my answers.
It appears the lung cancer has returned, and possibly spread to his brain. This would explain an awful lot of what has gone on with him this last 2/3 months.
A meeting is taking place with all the doctors whose care he has been in past and present to decide what, if any, treatment will be offered.
Consensus so far is that in Mr F's best interests, coming home with palliative care in place would be the best and least upsetting thing for him.
Happy for that to happen as he has always been a wonderful dad and hubby, and I know that is what he would want were he able to make that decision for himself.
I still want to know a lot more about what is to happen, but I guess the right folks will be on hand to help.
Thanks everyone :)