Refresh - it's on tonight, and it appears to be only the first half of a two-part doc, with the conclusion being aired next Tuesday at the same time.

Beeb page here - and also scroll down and click on the first of the "Related Links" at the bottom for a review of an interesting-sounding album released last September of some of her solo live performances for the BBC, plus a few extras in among the goodies like a DVD of her (brief) TV appearances and notebooks.

http://www.bbc.co.uk/radio2/musicclub/doc_sandydenny.shtml