not got round to watching it yet but it's recorded, along with the documentary about Nick that was shown six or seven years ago. I discovered Nick through John Martyn (Solid Air) and was stunned from the first two tracks of his debut album. His story is interesting and not quite as simple as it is sometimes made out to be. If you're interested in delving deeper, Trevor Dann's biography, Deeper then the darkest sea, is recommended, although his vague hints about Nick perhaps having suffered some form of abuse as a child are tiresome.
And if you don't have Five Leaves Left in your collection, you should !!