Hi Dick, Can't really answer re sale figures of "Unearthed" but I'm sure a quick E Mail to Julia Jones at Mollie Music would get the info for you. After all, I doubt if it's a state secret! and as it's producer, I would be intrigued to find out myself.
As far as video is concerned, an indepent TV producer is working on an hour long documentary on Nics life, due to be aired on the BBC in the spring. It includes some old footage of Nic playing, but, mainly concentrates on Nics performances this year with his son Joe (guitar) and Belinda O'Hooley (Keys/accordian) More news to follow.