Just so that anyone getting an appointment with a doctor other than their regular one is prepared.
The doctor will want to see your baseline medical info:
1) A full set of blood tests. The consultant at Pall Mall Medical is very thorough on this, and will insist on you getting done any that are missing. Because my NHS Hepatology clinic were being utterly obstructive to my attempts to go down the generics route (I'm still waiting for my case notes which I purchased several weeks ago under the freedom of information laws), I got a full set of tests done at Pall Mall Medical which cost me nearly £300. I've attached a copy of the results to give an indication of what's required.
2) A recent biopsy or fibroscan result, though an ultrasound scan result may be accepted (it was in my case).
3) Any previous or current medical issues, including any current medication. You shouldn't need documentary evidence of these, just a verbal explanation.