2 weeks back I met the first local guy I know of who is doing bio-D from waste restuarant oil.
It was a funny conversation: he was really keen to tell me all about what & how he was doing it, but when I asked where he was getting his oil, he clammed up.
It was an innocent question. Once I assured him I wasn't going to start my own bio-D conversion, he filled me in. But apparently it's not as easy as you might think to find a reliable source.