We had ours yesterday and can confirm comments made by other posters.
I couldn't get a "direct" answer to "when does this offer finish?" as I think the girl was trying to say "now" but if you have booked it will be ok.
When we came to pay our 2 x 150 lira - the desk pointed out that the computer said 600 lira (so I suspect that is what we got in real value terms) but our guide used a pass code to over ride the system.
We have been encouraged to go back in 3 and 6 weeks respectively because Gill had a small problem with her liver function and I had too much fat in my blood !!
The cost will be circa 50 & 70 lira so we will likely go but I suspect there are not totally necessary appointments.

Overall very pleased and sorry Karennina but I suspect it is over for the time being but still worth a call to Margaret at a cheap rate.
Ian