I'll repeat same advice I gave in another thread recently...
If you want more info about his case before the next consultation, or to understand what's already known and the basis on which decisions were made, try contacting the MacMillan nurses at the hospital. They have access to his records, and can explain what's been done, why, and what comes next, and can probably spend more time doing so that the consultant. I have found them very useful for this. I have even dropped in unannounced and they've always seen me (sometimes with a wait because they're with another patient), but better if you can call and make an appointment.
You (or your father) may have already been introduced to them. My hospital seems to have a rule that they must be present in the consultation when you are told you have cancer, and they continue it with you after the consultant appointment finishes.