In order:
"The Strange Last Voyage of Donald Crowhurst " ... read this I don't
know how many times, and still find it riveting ... by Nicholas
Tomalin and Ron Hall

You may be interested in these recent photos of his boat, Teignmouth
Electron. It's really fallen apart in the last 8 years. Some of these
photos are only a month old:

http://www.teignmouthelectron.org/view.php?v=thefuture

John.